USR IOT USR-TCP232-S2 Mounting instructions

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
1 / 41
USR-TCP232-S2 Software Manual
File version:V1.0.1

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
2 / 41
USR-TCP232-S2 Software Manual........................................................................................................................... 1
1. Overview.................................................................................................................................................................... 4
1.1. Brief Introduction...........................................................................................................................................4
2. Function..................................................................................................................................................................... 4
2.1. Configuration..................................................................................................................................................4
2.2. Work mode.....................................................................................................................................................4
2.2.1. Connection diagram:.........................................................................................................................5
2.2.2. TCP Client mode............................................................................................................................... 5
2.2.3. TCP Server mode..............................................................................................................................6
2.2.4. UDP Client mode...............................................................................................................................8
2.2.5. UDP Server mode............................................................................................................................. 8
2.2.6. HTTPD Client...................................................................................................................................10
2.2.7. TCP and UDP mechanism.............................................................................................................10
2.3. Configuration Protocol................................................................................................................................11
2.3.1. Network setting protocol command..............................................................................................11
2.3.2. Network echo command................................................................................................................ 15
2.3.3. Monitor function............................................................................................................................... 16
2.3.4. Serial port setting protocol.............................................................................................................17
2.3.5. Similar T24 series setting protocol............................................................................................... 21
2.4. UART Framing mechanism.......................................................................................................................24
2.4.1. packing method............................................................................................................................... 24
2.4.2. Flow calculation............................................................................................................................... 24
2.5. Special Function......................................................................................................................................... 24
2.5.1. RS485 Function...............................................................................................................................24
2.5.2. Transparent transmission cloud....................................................................................................25
2.5.3. Link Function....................................................................................................................................25
2.5.4. Factory Reset...................................................................................................................................25
2.5.5. Reset Function.................................................................................................................................25
2.5.6. ID Function....................................................................................................................................... 25
2.5.7. Index Function................................................................................................................................. 25
2.5.8. Similar RFC2217 Function............................................................................................................ 25
2.6. New Function...............................................................................................................................................26
2.6.1. AT Command....................................................................................................................................26
2.6.2. Display IP and Data........................................................................................................................ 26
2.6.3. Set Client Number in TCP Server Mode..................................................................................... 26
2.6.4. Defined MAC Address.................................................................................................................... 26
2.6.5. Defined DNS Server IP.................................................................................................................. 26
2.6.6. Defined Registration Package...................................................................................................... 26
2.6.7. Defined Heartbeat Package.......................................................................................................... 26
2.6.8. HTTPD Client...................................................................................................................................27
2.7. Firmware Upgrade......................................................................................................................................27
3. Webpage..................................................................................................................................................................27

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
3 / 41
3.1. Log in............................................................................................................................................................ 28
3.2. State Configuration.....................................................................................................................................28
3.3. Local IP.........................................................................................................................................................29
3.4. Serial Port Parameter................................................................................................................................ 30
3.5. Expand Function......................................................................................................................................... 31
3.6. Misc Configuration......................................................................................................................................31
3.7. Reboot.......................................................................................................................................................... 32
4. AT Command.......................................................................................................................................................... 32
4.1. AT Command Model...................................................................................................................................32
4.2. AT Command...............................................................................................................................................32
4.3. AT Command Set........................................................................................................................................33
4.3.1. AT+E.................................................................................................................................................. 33
4.3.2. AT +ENTM........................................................................................................................................ 33
4.3.3. AT+Z.................................................................................................................................................. 34
4.3.4. AT+VER.............................................................................................................................................34
4.3.5. AT+MAC............................................................................................................................................34
4.3.6. AT+CLEAR....................................................................................................................................... 34
4.3.7. AT+UART..........................................................................................................................................34
4.3.8. AT SOCKA1......................................................................................................................................35
4.3.9. AT+DHCPEN....................................................................................................................................35
4.3.10. AT+WANN...................................................................................................................................... 35
5. Appendix..................................................................................................................................................................36
AppendixⅠ:Meaning of Port parameter bit....................................................................................................36
AppendixⅡ:ID type of Independent ID........................................................................................................... 36
Appendix Ⅲ:Upper computer Socket programming example.................................................................... 37
Server Socket code:...........................................................................................................................................37
Client Socket code:............................................................................................................................................ 39
6. Contact information................................................................................................................................................41
7. Disclaimer................................................................................................................................................................41
8. Undated History......................................................................................................................................................41

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
4 / 41
1. Overview
1.1. Brief Introduction
TCP232-S2 is a new and tiny size serial to Ethernet module which realizes data bidirectional transparent
transmission between TTL Port and RJ45 Port, it can also used in RS232/ RS485 by level shift circuit.
S2 is equipped with Cortex-M0 core. It has characters of low power, fast speed, high efficiency, strong
compatibility, it is easy to use.
2. Function
2.1. Configuration
User should set parameter as follows:
Work mode:
TCP Client、TCP Server、UDP Client、UDP Server、HTTPD Client
Default TCP/UDP connection parameter
Connection type (Server, Client, HTTPD Client）
Target Port
Target IP address
Local Port
Serial Port parameter
Baud rate
Data bit
Check bit
Stop bit
RS485 function
IP address and module password
The way of getting IP address.
Module name and password
After setting parameter then reset the module .
2.2. Work mode
USR-TCP232-S2 work mode : TCP Client, TCP Server, UDP Client, UDP Server, HTTPD Client.
Work mode can be changed by webpage or software.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
5 / 41
2.2.1. Connection diagram:
Diagram 1
Note: For security , module only receive data from set target IP and Port., and send data to set target IP
And Port .
2.2.2. TCP Client mode
It has to be connected before transferring data.
1) In TCP Client Mode,TCP232-S2 connects TCP Server actively, establish a connection to transmit date
2) In TCP Client Mode, It has function of identifying disconnected link. When connected, it will send
keepalive package every 15s. If unconnected ,it can be detected timely and enforceTCP232-S2 to disconnect
the former link to establish a new one.
3) When TCP232-S2 try to connect remote server ,if the local port number is not “0" ,it will establish a
connection with the same source port every time.
4) It has synchronizing function of baud rate, user should install USR VCOM Software.
5) When local port number is “0” , it means local port is random.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
6 / 41
Diagram 2
2.2.3. TCP Server mode
1) It has to be connected before transferring data.
2 ) In TCP Server Mode, S2 monitors local port, it will response and establish a connection when there
is a request. Up to 4 links at the same time. Once received data, S2 serial port will send data to all the devices
which connect to TCP232-S2.
3 ) It has synchronizing function of baud rate, user should install USR VCOM Software.
4) In TCP Server Mode, The maximum number can be configured by user. TCP Client number is from 1
to 16, default value 4. When the Client link is more than 16, the new link will replace the former link from Link 1
If the Client link is more than 4, send and receive data at same time , the data flow should be within 2.5 KB/s

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
7 / 41

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
8 / 41
Diagram 3
2.2.4. UDP Client mode
1) The mode belongs to UDP Protocol.
2) In UDP Client Mode, TCP232-S2 won’t establish the connection actively. It can only communicate with
the target port whose IP has been set. When serial port receive data, it send data to target IP and port. If data
doesn’t come from this channel, it will not be accepted by TCP232-S2.
3) In UDP Client Mode, if target IP is set as 255.255.255.255, it can realize function of entire network
broadcast, also can receive broadcast data. If broadcast in network segment ,eg.192.168.0.255, it can only
send data ,can’t receive data.
4) Under UDP Client, maximum data length sent from MCU to TCP232-S2 is 1460.
Diagram 4
2.2.5. UDP Server mode
1) UDP Server is based on normal UDP, it doesn’t validate the source of IP address. Once received UDP
data, it convert target IP to data source IP, similar to TCP Server.
2) In UDP Server Mode, TCP232-S2 records an IP, Once it receives data, it will send data to record IP.
TCP232-S2 also works as a server, can receive data from Ethernet and convert target IP to data source IP.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
9 / 41

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
10 / 41
Diagram 5
2.2.6. HTTPD Client
This function is used for developer.
1) Module S2 send data to HTTP Server or receive from HTTP Server, complex HTTP protocol will be
done by S2, it is convenient for user to programming.
2) S2 received data from HTTP Server will send to serial port without process.
3) According to demand, user can define HTTP content., user can add,delete,modify every HTTP
Content ( if HTTP request is post, S2 will add Connection and Content-Length automatically )
2.2.7. TCP and UDP mechanism
Table 1 TCP and UDP mechanism
TCP
UDP
Advantages
Stable;
Not easy to lose data package;
Reliable connection mechanism;
Transmission interval is accurate;
No connection mechanism;
Easy and flexible;
Disadvantage
Easy to block up Information;
Under bad network condition, it is

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
11 / 41
Because of check and resend
mechanism, interval isn’t accurate
high risky to losing data package
2.3. Configuration Protocol
Configuration flow: to configure protocol cross segment ,all communication protocol is set by UDP
Broadcast, Little-endian .In UDP communication,target port number should be 1500. Local port
number is random. All communication protocol is UDP broadcast.
2.3.1. Network setting protocol command
Table-2- Query command
Function
Head of data
package
Length
(command-
1 bite)
Command
MAC
address
( 6 bite)
User name
and (12
bite)
Parameter
Check
bit
(sum)
Search
FF
01
01
-
-
-
02
Restart
FF
xx
02
[MAC]
[usrname]
[password]
-
xx
Read
configuration
FF
xx
03
[MAC]
[usrname]
[password]
-
xx
Basic setting
FF
xx
05
[MAC]
[usrname]
[password]
Basic
parameter
xx
Port 0 setting
FF
xx
06
[MAC]
[usrname]
[password]
Port
parameter
xx
Factory
Default
FF
xx
0b
[MAC]
[usrname]
[password]
-
xx
Cloud setting
FF
xx
0c
[MAC]
[usrname]
[password]
Port
parameter
xx
Heartbeat
package
Setting
FF
xx
21
[MAC]
[usrname]
[password]
Port
parameter
xx
Extension
setting
-
-
-
-
-
-
-
To confirm command accuracy ,we set algorithm of sending data and check method: sum check .
From length byte (include length) to check bit (not include check ) ,the sum is check value, only keep
lower byte.
Search command : Fixed command FF 01 01 02, sum check 02=01+01
Restart command : send (22 byte) FF 13 02 00 71 77 7C 42 2F 61 64 6D 69 6E 00 61 64 6D 69 6E 00
FC,
sum check: FC=13+02......6E+00,
From 4th to 9th is TCP232-T2 MAC address. The last 12 byte before check bit is user name and
password, both is 6 byte, if not, write 0 (the last byte of user name and password should be 0 , the

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
12 / 41
following name and password is the same rule)
Read Configuration command :send (22 byte) FF 13 03 00 71 77 7C 42 2F 61 64 6D 69 6E 00 61 64 6D
69 6E 00 FD,
FD= 13 + 03 + 00 + ... + 6E + 00
From 4th to 9th is TCP232-T2 MAC address. The last 12 byte before check bit is user name and
password, both is 6 byte, if not, write 0.
Basic setting command: it includes 67 basic parameter.
E.g : send FF 56 05 00 71 77 7c 42 2F 61 64 6d 69 6e 00 61 64 6d 69 6e 00 95 63 03 00 00 00 50 00
00 07 00 a8 c0 c9 00 a8 c0 00 FF FF FF 55 6c 6c 2d 66 32 00 00 00 00 00 00 00 00 00 00 61 64 6d 69 6e
00 61 64 6d 69 6e 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04, check byte uses sum
check method 04 = 56 + 05 + 00+ ... + 01;
From 4th to 9th is TCP232-T2 MAC address,10th to 22th is user name and password .The following
byte is basic setting parameter,the last byte is sum check byte.
Table 3 - basic setting command
Name
Byte
Example
Instruction
ucSequenceNum
1
00
Reserve package head
ucCRC
1
00
Reserve package head
ucVersion
1
00
Reserve package head
ucFlags
1
80
8th 0:DHCP；
1:Static IP
7 th 0:Turn off factory default function
1:Turn on factory default function
usLocationURLPort
2
00 00
Not enabled, reserved protocol
usHTTPServerPort
2
50 00
HTTP service port
ucUserFlag
1
00
Not enabled, reserved protocol
ulStaticIP
4
07 00 A8 C0
Static IP
ulGatewayIP
4
C9 00 A8 C0
Gateway
ulSubnetMask
4
00 FF FF FF
Subnet mask
ucModName
14
55 53 52 2D 4B 32 00 00
00 00 00 00 00 00
Module name
Protocol reserved
2
00 00
Must be 0
username
6
61 64 6D 69 6E 00
User name
password
6
61 64 6D 69 6E 00
Password
ucNetSendTime
1
00
Not enabled, reserved protocol
uiId
2
01 00
Device ID
ucIdType
1
A4
bit0(1): send ID when connecting ;
bit1(2): send ID when sending data;
bit2(4): RS485;
bit4(16): Reset;
bit5(32):Link-state;
bit6(64): index function;
bit7(128):Similar RFC2217 function,

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
13 / 41
mac_addrs
6
00 00 00 00 00 00
Device Mac address（only support query）
DNSGatewayIP
4
01 00 A8 C0
DNS address（only support query）
ucReserved
4
00 00 00 00
Unused
Port configuration: The parameter which is used to configure Lan port and Serial port is 63 byte .
E.g.: send ( 63 byte ) FF 52 06 00 71 77 7C 42 2F 61 64 6D 69 6E 00 61 64 6D 69 6E 00 00 C2 01 00
08 01 01 01 00 00 00 00 8C 4E 2A 20 31 39 32 2E 31 36 38 2E 30 2E 32 30 31 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 c9 00 A8C0 00 01 00 00 00 00 00 00 00 05 00 00 00 00 F0,
Check byte method : F0=52 + 06 + ... + 00 ;
From 4th to 9th is TCP232-T2 MAC address,10th to 22th is user name and password.the following is
port parameter +1 byte and check bit .
Table 4 - Port setting command
Name
Byte
Example
Instruction
ulBaudRate
4
00 C2 01 00
Serial port baud rate
ucDataSize
1
08
Serial port data bite (0X05/0x06/0x07/0x08)
ucParity
1
01
Serial port check bite
1:no, 2:odd, 3:even, 4:mark, 5:space
ucStopBits
1
01
Serial port stop bite (0x01/0x02)
ucFlowControl
1
00
Not enabled, reserved protocol
ulTelnetTimeout
4
00 00 00 00
Not enabled, reserved protocol
usTelnetLocalPort
2
8C 4E
Local port
usTelnetRemotePort
2
2a 20
Remote port
uiTelnetURL
30
31 39 32 2E 31 36 38
2E 30 2E 31 00 00 00
00 00 00 00 00 00 00
00 00 00 00 00 00 00
00 00
IP address or domain name send by ASCll
E.g.: 192.168.0.1
ulTelnetIPAddr
4
00 00 00 00
Not enabled,
ucFlags
1
00
Cloud function: For 5th ,
0: turn off cloud 1: turn on cloud
ucWorkMode
1
01
Work mode :
0: UDP, 1:TCP Client, 2: UDP Server,
3: TCP Server 4: HTTPD Client
HTPucFlags
1
00
0：HTTPD GET; 1:HTTPD POST
tc_number
1
04
Client number that TCP Server can connect
uiPackLen
2
00 00
Not enabled, reserved protocol
ucPackTime
1
0A
Serial port packing time
ucTimeCount
1
91
Write the read data as it is .
ucReserved
5
00 00 00 00 00
Write 00 00 00 00 00. For extension use
Factory default : send FF 13 0B 00 71 77 7C 42 2F 61 64 6D 69 6E 00 61 64 6D 69 6E 00 07;
Sum check: 07 = 13 + 0B+ ... + 6E + 00

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
14 / 41
From 4th to 9th is TCP232-T2 MAC address,10th to 21th is user name and password , both is 6
byte ,if not , write 0.
Cloud function command : send FF 13 0c 00 71 77 7c 42 2F 61 64 6d 69 6e 00 61 64 6d 69 6e 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 08;
Sum check：07 = 13 + 0c + ... + 6E + 00+...+00;
From 4th to 9th is TCP232-T2 MAC address,10th to 21th is user name and password , both is 6
byte ,if not , write 0. The following is Cloud ID and password, the last one is check bit.
Heartbeat package function: send FF 13 21 00 71 77 7c 42 2F 61 64 6d 69 6e 00 61 64 6d 69 6e 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1d;
Sum check: 1d = 13 + 21 + ... + 6E + 00+...+00;
From 4th to 9th is TCP232-T2 MAC address,10th to 21th is user name and
password, both is 6 byte ,if not , write 0. The following is heartbeat and registration
Sending direction,heartbeat time, heartbeat package length,registration package
length,heartbeat package,registration package,heartbeat package and registration
package are both 40 byte, if not,write 0, the last one is check bit.
Table 5 - Heartbeat&registration package command
Name
Byte
Example
Instruction
H_R_ucFlags
1
00
1th is 1 : heartbeat package to
Lan port.
2th is 1: heartbeat package to
Serial port.
3th is 1: send registration
package.
4th is 1: data carry registration
package.
5th is 1: httpd remove package
head.
6th is 1: turn on serial port setting
parameter function.
7th is 1: input heartbeat package
16 binary system.
8th is : input registration package
16 binary system.
heart_times
1
3c
heartbeat time
heart_len
1
00
heartbeat package length
register_len
1
00
registration package length
heartbeat
40
00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00
00
heartbeat package content

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
15 / 41
register_s
40
00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00
00
registration package content
2.3.2. Network echo command.
Search command return result : (36 byte) FF 24 01 00 00 c0 a8 00 07 00 71 77 7c 42 2F 01 0c 00 00 55 53
52 2d 4b 32 00 00 00 00 00 00 00 00 00 00 F2
Initial value is 0X00, subtract each byte in sequence.
F2= 00 - FF - 24 - 01 - 00 - 4B - ... - 31 - 00 – 00.
Table 6 - Search instruction reply command
Name
Byte
Example
Instruction
TAG_STATUS
0
FF
Fixed number
Packet_length
1
24
Fixed number
CMD_DISCOVER_TARGET
2
01
Fixed number
Board_type
3
00
Fixed number
Board_ID
4
00
Fixed number
Client_IP_address
5~8
C0 A8 00 07
Device IP（big-endian）
MAC_address
9~14
AC CF 23 20 FE 3D
Device MAC（big-endian）
Firemware_version
15~18
01 00 00
Firmware version
Application_title
19~34
55 53 52 2D 4B 32
00 00 00 00 00 00
00 00 00 00
Device name
checksum
35
F0
Initial value is 0x00, subtract
TAG_STATUS byte in sequence
u until the last byte. Result is
checksum
Return result of restart command: (4 byte )
FF 01 02 4B ,if user name and password is correct 4B = 'K'
FF 01 02 50 ,user name and password is wrong 50 ＝'P'
Return result of read command: return result is all parameters of TCP232-T2 ,264 byte
Not include check and protocol ,return parameter directly. Refer to Table 2-4. Return result
In 3 package. 130 byte, 50 byte, 84 byte.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
16 / 41
e.g.: 95 63 03 00 00 00 50 00 00 07 00 A8 C0 01 00 A8 C0 00 FF FF FF 55 53 52 2D 54 43 50 32 33 32
2D 33 31 30 00 00 61 64 6D 69 6E 00 61 64 6D 69 6E 00 00 01 00 A4 AC CF 23 20 FE 10 00 00 00 00 00
00 00 00 80 25 00 00 08 01 01 01 00 00 00 00 8C 4E 2A 20 31 39 32 2E 31 36 38 2E 31 2E 31 33 33 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 85 01 A8 C0 00 01 00 00 00 00 00 00 00 00 00 00 00；
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00;
If password is wrong ,it returns FF 01 03 50.
Return result of basic parameter setting :
If correct ,it return FF 01 05 4B. If password is correct 4B = 'K'
FF 01 05 50 If password is wrong 50 ＝'P'
Return result of serial port parameter setting :
If correct, it return FF 01 06 4B If password is correct 4B = 'K'
FF 01 06 50 If password is wrong 50 ＝'P'
Return result of cloud parameter setting :
If correct, it return FF 01 06 4B If password is correct 4B = 'K'
FF 01 06 50 If password is wrong 50 ＝'P'
Return result of heartbeat registration parameter setting :
If correct, it return FF 01 06 4B If password is correct 4B = 'K'
FF 01 06 50 If password is wrong 50 ＝'P'
Other return result:
If check sum is wrong , it return ”E” + right check sum.
Right operation: FF 01 CMD ’K ‘
If user name and password is wrong , it return FF 01 CMD ’P’
Other is wrong ,it returns FF 01 CMD’E’
2.3.3. Monitor function
If user want to monitor message, please do as follows with USR-M0 software.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
17 / 41
Diagram 7
2.3.4. Serial port setting protocol
Firstly ,user connect Reload(CFG) to the ground, user can refer to setting command or use software
,sending data baud is 9600, 8 data bit, 1 stop bit, （9600,n,8,1）.
No matter what the baud rate ever is , baud rate switches to 9600 idiomatically, send ‘U’ to port, ,it means
In the status of configuration, after receiving complete data package and check is right ,it returns “K” , if check
Is wrong, it returns “E” and calculated check bit, this bit is important when sending data by manual test. For
Other error,it just returns ‘E.
Restore factory setting Reload(CFG) and port setting Reload(CFG) is the same key. If user want to
restore factory setting, firstly short circuit Reload(CFG) , and port can’t send data until 5 seconds later.
<Note> after setting ,please pull up Reload(CFG) or don’t connect it ,then module can work again.
Data package head for port setting protocol has 3 types:
155BE write port0 configuration.
255 BD read T2 configuration.
355 BE write basic configuration.
455 BB write extended function parameter configuration.
555 B1 5A restart command;
Basic configuration : It includes some serial port parameter configuration. Total
67 byte, check bit xx= 00 + 00 +00+80 ... + 00. Send 55 BE+basic parameter+check bit,
If configuration is right ,it returns BE 4B, otherwise ,it returns BE 45.

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
18 / 41
Table 7 - Port setting command
Name
Byte
Example
Instruction
ucSequenceNum
1
00
Reserve package head
ucCRC
1
00
Reserve package head
ucVersion
1
00
Reserve package head
ucFlags
1
80
8th 0:DHCP；
1:Static IP
7 th 0:Turn off factory default function
1:Turn on factory default function
usLocationURLPort
2
00 00
Not enabled, reserved protocol
usHTTPServerPort
2
50 00
HTTP service port
ucUserFlag
1
00
Not enabled, reserved protocol
ulStaticIP
4
07 00 A8 C0
Static IP
ulGatewayIP
4
C9 00 A8 C0
Gateway
ulSubnetMask
4
00 FF FF FF
Subnet mask
ucModName
14
55 53 52 2D 4B 32 00
00 00 00 00 00 00 00
Module make
Protocol reserved
2
00 00
Must be 0
username
6
61 64 6D 69 6E 00
User name
password
6
61 64 6D 69 6E 00
Password
ucNetSendTime
1
00
Not enabled, reserved protocol
uiId
2
01 00
Device ID
ucIdType
1
A4
bit0(1): send ID when connecting ;
bit1(2): send ID when sending data;
bit2(4): RS485;
bit4(16): Reset;
bit5(32):Link-state;
bit6(64): index function;
bit7(128):Similar RFC2217 function,
mac_addrs
6
00 00 00 00 00 00
Device Mac address（only support query）
DNSGatewayIP
4
01 00 A8 C0
DNS address（only support query）
ucReserved
4
00 00 00 00
Unused
Port setting command: it include 65 byte, sum check method . Send 55 BF+basic parameter + check bit. If
correct ,it returns BE 4B. Otherwise, it returns BE 45.
Table 8 - Port setting command
Name
Byte
Example
Instruction
ulBaudRate
4
00 C2 01 00
Serial port baud rate
ucDataSize
1
08
Serial port data bite (0X05/0x06/0x07/0x08)
ucParity
1
01
Serial port check bite
1:no, 2:odd, 3:even, 4:mark, 5:space

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
19 / 41
ucStopBits
1
01
Serial port stop bite (0x01/0x02)
ucFlowControl
1
00
Not enabled, reserved protocol
ulTelnetTimeout
4
00 00 00 00
Not enabled, reserved protocol
usTelnetLocalPort
2
8C 4E
Local port
usTelnetRemotePort
2
2a 20
Remote port
uiTelnetURL
30
31 39 32 2E 31 36 38
2E 30 2E 31 00 00 00
00 00 00 00 00 00 00
00 00 00 00 00 00 00
00 00
IP address or domain name send by ASCll
E.g.: 192.168.0.1
ulTelnetIPAddr
4
00 00 00 00
Invalid byte , arbitrary configuration
ucFlags
1
00
Cloud function: For 5th ,
0: turn off cloud 1: turn on cloud
ucWorkMode
1
01
Work mode :
0: UDP, 1:TCP Client, 2: UDP Server,
3: TCP Server 4: HTTPD Client
HTPucFlags
1
00
0:HTTPD GET; 1:HTTPD POST
tc_number
1
04
Client number that TCP Server can connect
uiPackLen
2
00 00
Not enabled, reserved protocol
ucPackTime
1
0A
Serial port packing time
ucTimeCount
1
91
Write the read data as it is .
ucReserved
5
00 00 00 00 00
Write 00 00 00 00 00. For extension use
Read configuration command : TCP232-T2 send 55 BD, return value is 137 byte, there is
no check bit. TCP232-T2 return parameter is as follows.
Table 9 - Read configuration command
Name
Byte
Example
Instruction
ucSequenceNum
2
55 bd
Reserve package head
ucCRC
1
00
Reserve package head
ucVersion
1
00
Reserve package head
ucFlags
1
80
8th 0:DHCP；
1:Static IP
7th 0:Turn off factory default function
1:Turn on factory default function
usLocationURLPor
t
2
00 00
Not enabled, reserved protocol
usHTTPServerPort
2
50 00
HTTP service port
ucUserFlag
1
00
Not enabled, reserved protocol
ulStaticIP
4
07 00 A8 C0
Static IP
ulGatewayIP
4
C9 00 A8 C0
Gateway
ulSubnetMask
4
00 FF FF FF
Subnet mask
ucModName
14
55 53 52 2D 4B 32 00
00 00 00 00 00 00 00
Module name

USR-TCP232-S2 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
20 / 41
Protocol reserved
2
00 00
Must be 0
username
6
61 64 6D 69 6E 00
User name
password
6
61 64 6D 69 6E 00
Password
ucNetSendTime
1
00
Not enabled, reserved protocol
uiId
2
01 00
Device ID
ucIdType
1
A4
bit0(1): send ID when connecting ;
bit1(2): send ID when sending data;
bit2(4): RS485;
bit4(16): Reset;
bit5(32):Link-state;
bit6(64): index function;
bit7(128):Similar RFC2217 function,
mac_addrs
6
00 00 00 00 00 00
Device Mac address（only support query）
DNS Gateway IP
4
01 00 A8 C0
DNS address（only support query）
ucReserved
4
arbitrary value
Unused
ulBaudRate
4
00 C2 01 00
Serial port baud rate
ucDataSize
1
08
Serial port data bite (0X05/0x06/0x07/0x08)
ucParity
1
01
Serial port check bite
1:no, 2:odd, 3:even, 4:mark, 5:space
ucStopBits
1
01
Serial port stop bite (0x01/0x02)
ucFlowControl
1
00
Not enabled, reserved protocol
ulTelnetTimeout
4
00 00 00 00
Not enabled, reserved protocol
usTelnetLocalPort
2
8C 4E
Local port
usTelnetRemotePo
rt
2
2a 20
Remote port
uiTelnetURL
30
31 39 32 2E 31 36 38
2E 30 2E 31 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
IP address or domain name send by ASCll
E.g.: 192.168.0.1
ulTelnetIPAddr
4
00 00 00 00
Not enabled,
ucFlags
1
00
Cloud function: For 5th ,
0: turn off cloud 1: turn on cloud
ucWorkMode
1
01
Work mode :
0: UDP, 1:TCP Client, 2: UDP Server,
3: TCP Server 4: HTTPD Client
HTPucFlags
1
00
0：HTTPD GET; 1:HTTPD POST
tc_number
1
04
Client number that TCP Server can connect
uiPackLen
2
00 00
Not enabled, reserved protocol
ucPackTime
1
0A
Serial port packing time
ucTimeCount
1
91
Write the read data as it is .
ucReserved
5
00 00 00 00 00
Write 00 00 00 00 00. For extension use
Current IP
4
07 00 A8 C0
Current module IP address