S21 XP

User Guide

Mar. 2025

BITMAIN TECHNOLOGIES INC.

www.bitmain.com
 S21 XP User Guide

Table of Contents

1 Overview .......................................................................................................... 1

1.1 Server components ............................................................................................. 2

1.2 Server Specification ............................................................................................ 3

2 Setting up the Server ....................................................................................... 5

2.1 Setting up the Server ........................................................................................... 5

2.2 Configuring the Server ........................................................................................ 7

2.3 Monitor your Server............................................................................................ 8

3 Administering your Server .............................................................................. 9

3.1 Checking your Firmware Version ....................................................................... 9

3.2 Upgrading your System....................................................................................... 9

3.3 Modifying your Password ................................................................................. 10

3.4 Restoring Initial Settings .................................................................................. 11

3.5 Error Code ......................................................................................................... 11

4 Server Disassembly and Installation............................................................ 17

4.1 Control Panel Disassembly and Installation ................................................... 17

4.2 Power Supply Disassembly and Installation ................................................... 18

4.3 Hash Board Disassembly and Installation ....................................................... 20

5 Environmental Requirements....................................................................... 22

5.1 Basic Environmental Requirements ................................................................ 22

5.1.1 Climatic Conditions ..................................................................................................... 22
5.1.2 Site Requirements of the Server Running Room ..................................................... 22
5.1.3 Electromagnetic Environmental Conditions ............................................................ 22

5.2 Other Environmental Requirements ............................................................... 23

5.2.1 Mechanical Active Substances ................................................................................... 23
5.2.2 Corrosive Gas ............................................................................................................... 23

6 Regulations .................................................................................................... 24
6.1 Federal Communications Commission (FCC) .................................................. 24
 S21 XP User Guide
6.2 Industry Canada ................................................................................................ 24

6.3 European Community ....................................................................................... 24

6.4 Taiwan ROHS ..................................................................................................... 25

6.5 FCC Supplier’s Declaration of Conformity ....................................................... 25

6.6 EU Declaration of Conformity ........................................................................... 27

7 Warranty ........................................................................................................ 28
 S21 XP User Guide

1 Overview
The S21 XP server is one of BITMAIN’s latest Air-Cooling server product. This guide set
S21XP as an example introduce various operations in details, and other server operation
are the same.

Front View Back View

Caution:
(1) Please refer to the layout above to place your goods in usage in case of any damage.
(2) The equipment must be connected to an earthed mains socket‐outlet. The socket‐
outlet shall be installed near the equipment and shall be easily accessible.
(3) When the equipment is power off, be sure to power off all power inputs.
(4) DO NOT remove any screws and cables tied on the product.
(5) Do not plug or remove the device when it is powered on.
(6) The equipment relies on the PDU being powered down to disconnect the power.

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1.1 Server components

The main components and controller front panel of S21 XP servers are shown in the
following figure:

Reset Button Ethernet Connector OLED Fault Indicator

Micro USB Slot IP Report Button Normal Operation Indicator

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Power Supply:

Power Supply Socket

NOTE:
(1) Power supply APW171215 is part of S21 XP server. For detailed parameters, please
refer to the specifications below.
(2) One ANTWIRE‐20SP power cord is needed and should be connected to PDU.

1.2 Server Specification

Table 1-1 Product Glance

Product Glance Value
Model S21 XP
Version 10
Crypto algorithm/coins SHA256 | BTC/BCH/BSV
Typical Hashrate, TH/s(1-1) 270
Power on wall @25℃(1-2), Watt(1-1) 3645
Power efficiency on wall @25℃(1-2), J/T(1-1) 13.5

Table 1-2 Detailed Characteristics of Product

Detailed Characteristics Value
Power supply
Power supply AC input voltage(2-1), Volt 220~277V AC
Power supply AC Input Frequency Range, Hz 50~60
Power supply AC Input current(2-2), Amp 20
Hardware Configuration
Network connection mode RJ45 Ethernet 10/100M
Server size (Length*Width*Height, w/o package),
449*219*293
mm
Server size (Length*Width*Height, with package),
640*360*450
mm
Net weight, kg 18.7
Gross weight, kg 21.5
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Noise(2-3)@30℃, dBA 76
Fan rated speed(2-3), RPM 6400
Max airflow(2-4), CFM 480
Environment Requirements
Operation temperature, °C ‐20~45
Storage temperature, °C ‐20~70
Operation humidity, RH 10%~90%
Operation altitude(2-5), m ≤2000

NOTE:

(1‐1) The Hashrate value, Power on wall, and Power efficiency on wall are all typical values.
The actual Hashrate value fluctuates by ±3%, and the actual Power on wall and Power
efficiency on wall fluctuate by ±5%.
(1‐2) Inlet air temperature.
(2‐1) Caution: Wrong input voltage may probably cause server damaged.
(2‐2) Single‐phase AC input 20A.
(2‐3) Max condition: Fan is under max RPM(rotation per minute).
(2‐4) When the server is dusty or the environment is poorly ventilated, the server airflow
will reduce.
(2‐5) When the server is used at an altitude from 900m to 2000m, the highest operating
temperature decreases by 1℃ for every increase of 300m.

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2 Setting up the Server

NOTE:
 The file IPReporter.zip is supported by Microsoft Windows only.

2.1 Setting up the Server

To set up the server:
1. Go to the following site:
https://file12.bitmain.com/shop-product/firmware/IP%20Reporter.zip.
If the link is invalid, please visit the official firmware download page
(https://service.bitmain.com/support/download) and select as shown in the image to
download IPReporter.zip.

2. Download the following file: IPReporter.zip.

3. Extract the file.
NOTE:
 The default DHCP network protocol distributes IP addresses automatically
4. Right-click IPReporter.exe and run it as Administrator.
5. Select one of the following options:
■ Shelf, Step, Position – suitable for farm servers to mark the location of the servers.
■ Default – suitable for home servers.
6. Click Start.

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7. On the control panel, click the IP Report button. Hold it down until it beeps (about 5
seconds).
Reset Button Ethernet Connector OLED Fault Indicator

Micro USB Slot IP Report Button Normal Operation Indicator

The IP address will be displayed in a window on your computer screen.

8. In your web browser, enter the IP address provided.

9. Proceed to login using root for both the username and password.
10. In the Protocol section, you can assign a Static IP address (optional).
11. Enter the IP address, Subnet mask, gateway and DNS Server.
12. Click “Save”.
13. Click https://support.BITMAIN.com/hc/en-us/articles/360018950053 to learn more
about gateway and DNS Server.

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2.2 Configuring the Server

Setting up the Pool
To configure the server:
1. Click Settings as below.

2. Set the options according to the following table:

Note:
 Fan speed percentage can be adjusted, but we recommend to keep the default setting.
The server will adjust the fan speed automatically if the fan speed percentage has yet
been selected.
 There are two working modes of S21 XP server: Normal mode and Sleep mode. The
server enters the sleep mode under the condition that the control board is powered
while hashboards are not powered.
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Option Description
Mining address Enter the address of your desired pool.
The S21 XP server can be set up with three mining
pools, with decreasing priority from the first pool (pool 1) to
the third pool (pool 3). The pools with low priority will only
be used if all higher priority pools are offline.

Name Your worker ID on the selected pool.

Password (optional) The password for your selected worker.

3. Click Save after the configuration.

2.3 Monitor your Server

To check the operating status of your server:

1. Click dashboard marked below to check the server status (taking S21 XP 270T as
an example).

2. Monitor your server according to the descriptions in the following table:

Option Description
Number of chips Number of chips detected in the chain.

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Frequency ASIC frequency setting.

Real Hashrate Real-time hashrate of each hash board (GH/s).

Inlet Temp Temperature of the inlet (°C).

Outlet Temp Temperature of the outlet (°C).

Chip state One of the following statuses will appear:

● The Green Icon - indicates normal

● The Red Icon- indicates abnormal

3. Monitor your server according to the LED indicator light:

Status Fault Indicator(RED) Normal Indicator(GREEN)

Normal OFF ON
Over ON OFF
temperature
Network ON OFF
disconnection
Fan failure ON OFF

3 Administering your Server

3.1 Checking your Firmware Version
To check your firmware version:
1. Enter the backend of your server, find the firmware version at the bottom.
2. Firmware Version displays the date of the firmware your server uses. In the
example below, the server is using firmware version 20241105164248.

3.2 Upgrading your System

Caution: Make sure that the S21 XP server remains powered during the upgrade process.
If power fails before the upgrade is completed, you will need to return it to BITMAIN for
repair.
To upgrade the server’s firmware:
1. In System, click Firmware Upgrade.

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2. For Keep Settings:

(1) Select “keep settings” to keep your current settings (default).
(2) Unselect “keep settings” to reset the server to default settings.

3. Click the button and navigate to the upgrade file. Select the upgrade file,
then click Update.
4. When the upgrade is completed, restart the server. It will return to the settings page.
5. Click one of the following options:
■ Reboot - to restart the server with the new firmware.
■ Go Back - to continue mining with the current firmware. The server will load the
new firmware next time it is restarted.

3.3 Modifying your Password

To change your login password:
1. In System, click the Password tab.
2. Set your new password, then click Save.

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3.4 Restoring Initial Settings

To restore your initial settings:
1. Turn on the server and let it run for 5 minutes.
2. On the controller front panel, press and hold the Reset button for 10 seconds.

Caution: Resetting your server will reboot it and restore its default settings. The red
LED will automatically flash once every 15 seconds if the reset is operated successfully.

3.5 Error Code

Here is the server error code and the corresponding reasons and suggestions:

Error Code Reason Suggestion

R:1 Average total Update the firmware to the latest version,

hashrate is low replace the power supply, or return to factory
for repair

R1:1 Chain1 is Check if chain1 connection is normal, update

broken or has the firmware to the latest version, replace the
low hashrate hashboard, or return to factory for repair

R2:1 Chain2 is Check if chain2 connection is normal, update

broken or has the firmware to the latest version, replace the
low hashrate hashboard, or return to factory for repair

R4:1 Chain3 is Check if chain3 connection is normal, update

broken or has the firmware to the latest version, replace the
low hashrate hashboard, or return to factory for repair

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R8:1 Chain4 is Check if chain4 connection is normal, update
broken or has the firmware to the latest version, replace the
low hashrate hashboard, or return to factory for repair

J1:1 Chain1 has bad Update the firmware to the latest version,
ASIC replace the power supply, or return to factory
for repair

J2:1 Chain2 has bad Update the firmware to the latest version,
ASIC replace the power supply, or return to factory
for repair

J4:1 Chain3 has bad Update the firmware to the latest version,
ASIC replace the power supply, or return to factory
for repair

J8:1 Chain4 has bad Update the firmware to the latest version,
ASIC replace the power supply, or return to factory
for repair

N:1 Average total Update the firmware to the latest version

hashrate
exceeds the
sale hashrate
too much

N:2 Frequency is Update the firmware to the latest version

reduced too
much

V:1 Power Check power output wiring, update the

initialization firmware to the latest version, replace the
error or power power supply, or return to factory for repair
output voltage
error

V:2 Power supply Update the firmware to the latest version,

is not replace the power supply, or return to factory
calibrated for repair

F:1 Fan error Check if the fan connection is normal, replace

the power supply, or replace the fan

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F1:1 Fan1 is not Check if the fan1 connection is normal, replace
detected or its the power supply, or replace the fan
speed is low

F2:1 Fan2 is not Check if the fan2 connection is normal, replace

detected or its the power supply, or replace the fan
speed is low

F4:1 Fan3 is not Check if the fan3 connection is normal, replace

detected or its the power supply, or replace the fan
speed is low

F8:1 Fan4 is not Check if the fan4 connection is normal, replace

detected or its the power supply, or replace the fan
speed is low

J:8 The number of Check if the hashboard connection is normal,

hashboards is or replace the hashboard
less than the
design

P:1 High Check if the environment temperature is

temperature normal, or check if the gel on the hashboard is
protection effective

P:2 Low Check if the environment temperature is

temperature normal
protection

J1:4 Chain1 Redo the factory test for chain1

EEPROM data
error

J2:4 Chain2 Redo the factory test for chain2

EEPROM data
error

J4:4 Chain3 Redo the factory test for chain3

EEPROM data
error

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J8:4 Chain4 Redo the factory test for chain4
EEPROM data
error

J:6 Temperature Check if the hashboard connection is normal,

sensor error update the firmware to the latest version,
replace the hashboard, or return to factory for
repair

J1:5 Chain1 PIC Check if chain1 connection is normal, update

error the firmware to the latest version, replace the
hashboard, or return to factory for repair

J2:5 Chain2 PIC Check if chain2 connection is normal, update

error the firmware to the latest version, replace the
hashboard, or return to factory for repair

J4:5 Chain3 PIC Check if chain3 connection is normal, update

error the firmware to the latest version, replace the
hashboard, or return to factory for repair

J8:5 Chain4 PIC Check if chain4 connection is normal, update

error the firmware to the latest version, replace the
hashboard, or return to factory for repair

M:1 Memory Update the firmware to the latest version,

allocation replace the control board, or return to factory
error for repair

J1:2 The number of Check if chain1 connection is normal, update

chain1 chips is the firmware to the latest version, replace the
less than the hashboard, or return to factory for repair
design

J2:2 The number of Check if chain2 connection is normal, update

chain2 chips is the firmware to the latest version, replace the
less than the hashboard, or return to factory for repair
design

J4:2 The number of Check if chain3 connection is normal, update

chain3 chips is the firmware to the latest version, replace the
less than the hashboard, or return to factory for repair
design

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J8:2 The number of Check if chain4 connection is normal, update
chain4 chips is the firmware to the latest version, replace the
less than the hashboard, or return to factory for repair
design

L1:1 Chain1 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
exceeds the
limit

L2:1 Chain2 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
exceeds the
limit

L4:1 Chain3 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
exceeds the
limit

L8:1 Chain4 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
exceeds the
limit

L:2 Cannot find the Update the firmware to the latest version, or
mixed level return to factory for repair

L1:2 Chain1 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
mismatch

L2:2 Chain2 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
mismatch

L4:2 Chain3 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
mismatch

L8:2 Chain4 voltage Update the firmware to the latest version, or

or frequency return to factory for repair
mismatch

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N:4 Network Check if the network connection is normal
connection is
lost

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4 Server Disassembly and Installation

4.1 Control Panel Disassembly and Installation
1. Remove the 4 upper cover screws of the server, as shown in the figure：.

2. Remove the two upper covers and unplug a total of 9 cables on the control board,
including the operation board arrangement cables, the fan cables, the control board
power supply cables and the power supply voltage regulating cables, as shown in
the figure：

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3. Remove 2 screws from the front cover of the control panel, remove the front cover,
and push the control panel along the chute, as shown in the figure：

4. The installation steps are opposite to the disassembly steps, and it can be install in
the steps of the opposite above order.

4.2 Power Supply Disassembly and Installation

1. Remove the 2 upper caps according to the above method.

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2. Unplug the 2 cables connected to the control board and remove the 4 copper
screws, as shown in the figure：

3. Remove the power supply and chassis fixing screws, as shown in the figure：

4. Take out APW power supply, as shown in the figure：

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5. The installation steps are opposite to the disassembly steps, and it can be install in
the steps of the opposite above order.

4.3 Hash Board Disassembly and Installation

1. Remove the 2 upper caps according to the above method.
2. Remove 4 screws and remove the fan and baffle, as shown in the figure：

3. Pull out the cable of the hash board, unscrew two screws on the copper bar, and the
hash board can be pulled out, as shown in the figure：

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4. Remove the cables and screws, the rest of the hash board can be extracted, as
shown in the figure:

5. The installation steps are opposite to the disassembly steps, and you can install in
the steps of the opposite above order.

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5 Environmental Requirements
Please ensure that your server operates in accordance with the following environmental
requirements.

5.1 Basic Environmental Requirements

5.1.1 Climatic Conditions

Table 5-1 Requirements of climatic conditions

Descriptions Requirements
Operating Temperature, °C -20-45
Operating Humidity, RH 10-90%(non-condensing)
Storage Temperature, °C -20-70
Storage Humidity, RH 10-90%(non-condensing)
Altitude, m <2000

5.1.2 Site Requirements of the Server Running Room

Please ensure that the server operating room is kept away from industrial pollution
sources:
(1) For heavy pollution sources such as smelters and coal mines, maintain a distance
of more than 5 km.
(2) For moderate pollution sources such as chemical industries, rubber, and
electroplating industries, maintain a distance of more than 3.7 km.
(3) For light pollution sources such as food factories and leather processing factories,
maintain a distance of more than 2 km. If unavoidable, choose a site in the
perennial upwind direction of the pollution source.
Please do not set up your location within 3.7 km of the seaside or a saltwater lake. If this
is unavoidable, ensure that the structure is as airtight as possible and equipped with air
conditioning for cooling.
Please clean your server when the machine surface is found to be heavily dusted (it is
recommended to check once a month).
Please click https://support.bitmain.com/hc/en-us/articles/115004520173-How-to-cle
an-and-dust-the-ANTMINER to get more information about how to clean your server.

5.1.3 Electromagnetic Environmental Conditions

Please keep your site away from transformers, high-voltage cables, transmission lines,
and high-current equipment. For example, there should be no high-power AC
transformers (>10KA) within 20 meters, and no high-voltage power lines within 50

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meters. Additionally, keep your site away from high-power radio transmitters; for
example, there should be no high-power radio transmitters (>1500W) within 100 meters.

5.2 Other Environmental Requirements

The server running room shall be free of explosive, conductive, magnetically conductive
and corrosive dust. The requirements of mechanical active substances are shown below.

5.2.1 Mechanical Active Substances

Table 5-2 Requirements of mechanical active substances

Mechanical Active Substance Requirement

Sand, mg/m3 ≤30
Dust (suspended), mg/m3 ≤0.2
Dust (deposited) , mg/ m2h ≤1.5

5.2.2 Corrosive Gas

Table 5-3 Requirements of corrosive gas

Corrosive Gas Unit Concentration

H2S ppb <3
SO2 ppb < 10
Cl2 ppb <1
NO2 ppb < 50
HF ppb <1
NH3 ppb < 500
O3 ppb <2

Note: ppb (part per billion) refers to the unit of concentration, 1ppb stands for the volume ratio
of part per billion.

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6 Regulations
6.1 Federal Communications Commission (FCC)
FCC Notice:
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.

Note:
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment in
a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.

Caution:
Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.

6.2 Industry Canada

CAN ICES-003(A) / NMB-003(A)

6.3 European Community

Warning: Operation of this equipment in a residential environment could cause radio
interference.

UAB Bitmain Development Lithuania

Vilnius, Bistrycios g.40-21

EU WEEE
Disposal of Waste Equipment by Users in Private Household in the European
Union:

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This symbol on the product or on its packaging indicates that this product
must not be disposed of with your other household waste. Instead, it is your
responsibility to dispose of your waste equipment by handling it over to a
designated collection point for the recycling of waste electrical and
electronic equipment. The separate collection and recycling of your waste equipment at
the time of disposal will help to conserve natural resources and ensure that it is recycled
in a manner that protects human health and the environment. For more information
about where you can drop off your waste equipment for recycling, please contact your
local city office, your household waste disposal service or the shop where your purchased
the product.

6.4 Taiwan ROHS

設備名稱：服務器 型號：S21 XP
限用物質及其化學符號
單元 鉛 汞 鎘 六價鉻 多溴聯苯 多溴二苯醚
(Pb) (Hg) (Cd) ( Cr6+) (PBB) (PBDE)

外殼 ○ ○ ○ ○ ○ ○
電源 — ○ ○ ○ ○ ○
風扇 — ○ ○ ○ ○ ○
控制板 ○ ○ ○ ○ ○ ○
算力板 ○ ○ ○ ○ ○ ○
線材組件 ○ ○ ○ ○ ○ ○

備考 1.〝超出 0.1 wt %〞及〝超出 0.01 wt %〞係指限用物質之百分比含量超出百分比含量基準值。

備考 2.〝○〞係指該項限用物質之百分比含量未超出百分比含量基準值。

備考 3.〝－〞係指該項限用物質為排除項目。

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6.5 FCC Supplier’s Declaration of Conformity

Supplier’s Declaration of Conformity

Trade Name:

Model Number: S21 XP

Responsible Part---U.S. Contact Information

Company: Bitmain Technologies Delaware Limited

Street Address: 100 Spectrum Center Drive, Suite 1255

City, State: City of Irvine, State of CA – California

Zip Code: CA 92618

Telephone number: +1 949-381-9884

Internet contact information: https://www.bitmain.com/

FCC Compliance Statement:

This device complies with Part 15 of the FCC Rules. Operation is subject to the

following two conditions: (1) This device may not cause harmful interference, and

(2) this device must accept any interference received, including interference that

may cause undesired operation.

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6.6 EU Declaration of Conformity

EU Declaration of Conformity

Manufacturer’s Name: BITMAIN DEVELOPMENT PTE. LTD.

Manufacturer’s Address: 1 Raffles Place, #36-01 One Raffles Place, Singapore 048616

For the following equipment

Trade Mark:
Product: Server

Model No.: S21 XP

is herewith confirmed to comply with the requirements set out in Directive 2014/35/EU,
Directive 2014/30/EU, and Directive 2011/65/EU. Compliance with 2014/35/EU and
2014/30/EU are evaluated by applying the following standards:

Safety standard: EN 62368-1:2014+A11

EMC standard: EN 55032:2015+A11:2020(Class A); EN 55032: 2015;
EN 55035: 2017; EN 55035: 2017+A11:2020
EN IEC 61000-3-2: 2019; EN 61000-3-3: 2013+A1:2019

This declaration of conformity is issued under the sole responsibility of the manufacture.

Signature: Date:
Position/Title:

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7 Warranty
1. A 365-day warranty is provided starting from the shipping date. BITMAIN will cover
shipping costs when shipping a replacement unit within the warranty period.
2. The warranty only applies to the original purchaser who purchased the machine
directly from BITMAIN. Once the miner is resold, warranty coverage becomes the
responsibility of the re-seller.
3. If the user fails to use the product per the given instructions, specifications, and
conditions provided or changes the function settings of the unit without BITMAIN's prior
consent, BITMAIN will not be liable for any damage arising therefrom.
4. Click https://service.bitmain.com/support/policy for a complete list of the Terms &
Conditions that apply to all orders placed on https://shop.bitmain.com.
Note:
 Only new machines are eligible for a 365-day warranty; used machines are not
included.

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1. 注意不同机型的内容变更（产品手册内容、网页截图、拆机截图）
2. 认证内容根据具体机型删增

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