odot ODOT-S4E2 User manual

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Modbus RTU/ASCII to Modbus TCP
Protocol Converter
ODOT Series Gateways
ODOT-S4E2 User Manual
ODOTAutomation System Co., Ltd.
2020-09-20
Copyright©2020 All rights reserved by ODOT Automation

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Version information
Revision records：
DATE
Version number
Modify content
The author
2016-02-20
V1.0
First release
SXL
2016-07-14
V1.1
Software configuration
upgrade version
JPL
2017-06-06
V1.3
Modify version
CCL
2018-08-01
V2.0
Hardware Updating
CCL
2019-06-27
V2.1
Updating Serial
Port Dialing
Method
CCL
2020-09-20
V2.2
Hardware
Updating
CCL
Ownership information
Without the consent of the copyright owner, the whole or part of this document do not be
republished as paper or electronic document.
Disclaimer
This document is only used to assist readers for using products. The company is not
responsible for loss or mistake because of using this document. The text and product
described in this document is constantly developing and improving.
Sichuan ODOT Automation System Co., Ltd. has the right to modify this document
without notifying users.

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Contents
Modbus RTU/ASCII to Modbus TCP ........................................... 1
Protocol Converter.......................................................... 1
ODOTAutomation System Co., Ltd. ......................................... 1
Version information....................................................... 2
Ownership information .................................................... 2
Disclaimer .............................................................. 2
1. Product Overview .......................................................... 4
1.1 Product Functions ....................................................... 4
1.2 Main features........................................................... 4
1.3 Technical parameters ..................................................... 5
2. Hardware description........................................................ 7
2.1 Product appearance ...................................................... 7
2.2 LED indicator description ................................................. 7
2.3 Terminal definition ...................................................... 8
2.4 Reset button........................................................... 10
2.5 External terminal resistance............................................... 12
2.6 Installation dimension ................................................... 12
3. HOW TO USE THE PROTOCOL CONVERTER ............................. 13
3.1．The description of protocolconverter...................................... 13
3.2. Default parameters ..................................................... 19
3.3 Gateway IP address modification .......................................... 21
3.4 Typical application description ............................................ 24

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1. Product Overview
1.1 Product Functions
ODOT-S4E2, developed by Sichuan ODOTAutomation System Co., Ltd., is a Modbus RTU to
Modbus TCP/IP protocol converter based on market demand and years of experience.
By applying ODOT-S4E2, all the Modbus RTU/ASCII slave devices with RS485/RS422/RS232 port
could connect to Modbus TCP/IP network and communicate with TCP clients. It could realize high speed
data transmission by connecting the low speed serial device to the high-speed Ethernet. This protocol
converter provides two working modes of transparent transmission and mapping mode, which could
achieve the maximum system compatibility.
1.2 Main features
◆9-36V wide range voltage input, anti-reverse connection protection.
◆Communication terminal isolation processing, 1500V isolation voltage
◆Dual Ethernet port, with switch function, support cascading.
◆2 kV network port isolation protection, 10/100Mbps auto-negotiation and Auto-MDI
/MDIX.
◆Support address mapping mode, realize fast response to TCP client request.
◆Connect up to 5 clients request.
◆Mapping mode supports function code:0x01,0x02,0x03,0x04,0x05,0x06,0x0F,0x10.
◆Transmission mode supports all public function code and customized function code.
◆10KB huge data buffer area, larger data transmission capacity.
◆4*RS485 serial ports real time refresh, short scan period, better loading capability.
◆RTU andASCII master and slave is optional, with stronger adaptability.
◆Watchdog could be enabled, watchdog time could be set.
◆Supports IAP download, and it could update and upgrade firmware program in product
through network port.

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◆Built-in terminal resistance and bias circuit, strong stability.
◆The data packet sending interval could be adjusted freely, and the use is more flexible.
◆The device carries with powerful diagnostic function to monitor the communication
status of the slave device in real time.
◆Support one key reset function to restore factory Settings.
◆35mm standard DIN-rail.
◆EMC complies EN 55022:2010 & EN55024:2010 international standard.
1.3 Technical parameters
The relevant technical parameters of this product are shown in Table 1. Please use this
product within the parameters of this product in order to obtain better performance.
Table1 Technical Parameters
Environment Parameter
Operating temperature
-40~85℃
Storage temperature
-55~125℃
Humidity
5%~95% (no condensing )
Power parameter
Number of power terminal
1 way
Power range
9~36VDC
Consumption
Max.200mA@24V

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Ethernet parameter
Working mode
Transparent transmission mode and address
mapping mode is optional
Number of ethernet
terminal
2RJ45，10M/100M auto-adaption with
router function
Networking protocols
ETHERNET, ARP, IP, TCP and ICMP
Number of TCP connection
Max. 5
Serial parameter
Number of serial port
4*RS485/RS232 or 2*RS422
Serial Communication
mode
RTU mode & ASCII mode is optional
Baud rate
1200~115200 bps
Checking mode
None, odd, even
Number of slave supported
Max.124（without relay）
Mapping mode protocol
Function code
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x0F, 0x10
Modbus buffer area
0xxxx area（coil）：8192 Bit
1xxxx area（discrete magnitude input）：8192 Bit
3xxxx area（input register）：2048 Word
4xxxx area（hold register）：2048 Word
3xxxx area（system diagnose zone）：263 Word

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2. Hardware description
2.1 Product appearance
2.2 LED indicator description
There are total 6 LED status indicators. The symbol definition and status
description are shown in “Table 2”.

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Table 2 LED indicator description
Symbol
Definition
Status
Description
PWR
Power supply indicators
ON
Power is supplied to the unit
OFF
No power is supplied to the unit
ETH
Network fault indicators
ON
TCP gateway communication error
OFF
TCP gateway
communication normal
CO1
Series port 1sending
& receiving indicator
Flashing
Series port 1 is sending &
receiving data
ON
Series port 1 is not sending &
receiving data
CO2
Series port 2sending
& receiving indicator
Flashing
Series port 2 is sending &
receiving data
ON
Series port 2 is not sending &
receiving data
CO3
Series port 3sending
& receiving indicator
Flashing
Series port 3 is sending &
receiving data
ON
Series port 3 is not sending &
receiving data
CO4
Series port 4sending
& receiving indicator
Flashing
Series port 4 is sending &
receiving data
ON
Series port 4 is not sending &
receiving data
Note: * ——In normal communication, the status of the ODOT-S4E2 gateway indicator
2.3 Terminal definition
1. The equipment wiring adopts 16Pin 3.81mm pitch plug-in terminal. The terminal definition of
RS485/RS232/RS422 interface is shown in "Table 3".

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Table 3 Terminal definition
No
.
RS485
RS232
RS422
Symbol
Wiring
Definition
Wiring Definition
Wiring Definition
1
1RT-
Serial Port1
RS485-
Serial Port1
RS232_RX
RS422Channel1
RS422 Sending
Negative Terminal
2
1TT+
Serial Port1
RS485+
Serial Port1
RS232_TX
RS422 Sending
Positive Terminal
3
SGND
Signal Grounded
Signal Grounded
Signal Grounded
4
PE
Shield Earthing
Shield Earthing
Shield Earthing
5
2RR-
Serial Port2
RS485-
Serial Port2
RS232_RX
RS422 Receiving
Negative Terminal
6
2TR+
Serial Port2
RS485+
Serial Port2
RS232_TX
RS422 Receiving
Positive Terminal
7
SGND
Signal Grounded
Signal Grounded
Signal Grounded
8
PE
Shield Earthing
Shield Earthing
Shield Earthing
9
3RT-
Serial Port3
RS485-
Serial Port3
RS232_RX
RS422 Channel 2
RS422 Sending
Negative Terminal
10
3TT+
Serial Port3
RS485+
Serial Port3
RS232_TX
RS422
Sending Positive
Terminal
11
SGND
Signal Grounded
Signal Grounded
Signal Grounded
12
PE
Shield Earthing
Shield Earthing
Shield Earthing
13
4RR-
Serial Port4
RS485-
Serial Port4
RS232_RX
RS422 Receiving
Negative Terminal
14
4TR+
Serial Port4
RS485+
Serial Port4
RS232_TX
RS422 Receiving
Positive Terminal
15
SGND
Signal Grounded
Signal Grounded
Signal Grounded
16
PE
Shield Earthing
Shield Earthing
Shield Earthing
2. Power terminals are defined as follows
No.
Symbol
Definition
1
PE
Grounding terminal
2
V-
Power Input Negative
3
V+
Power Input Positive

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2.4 Reset button
The device has a system RESET button (RESET). When the user forgets the IP address and
configured port number of the device and cannot connect to the gateway, the RESET button can
be triggered. System parameters will be restored to factory Settings and the device will be
restarted. Click the reset button with a paper clip, and all the indicator lights will shine once to
indicate successful reset. So the gateway reset is successful. The technical parameters of the
gateway are as follows:
Parameter Name
Defaults
Ethernet
Side
Protocol converter IP
192.168.1.254
Subnet mask
255.255.255.0
LAN gateway IP
192.168.1.1
Modbus TCP data port
502
Configure the port
1024
Modbus-TCP
watchdog time
30S
The enabling of
Modbus-TCP watch
dog
enabling