Wiring Diagram

Note: Only one serial port type can be connected to a single channel at the same time. The wiring shown in the diagram is for illustration purposes only, and specific connections should be made according to practical usage.

Terminal Description

Terminal	Terminal Description
R1+/A1	COM1 serial port RS422 signal receive +	COM1 serial port RS485 signal receive A+
T1+	COM1 serial port RS422 signal transmit +
R1-/B1	COM1 serial port RS422 signal receive -	COM1 serial port RS485 signal receive B-
T1-	COM1 serial port RS422 signal transmit -
R1	COM1 serial port RS232 signal receive
T1	COM1 serial port RS232 signal transmit
GND	COM1 serial port RS232 signal GND
PE	Ground
R2+/A2	COM2 serial port RS422 signal receive +	COM2 serial port RS485 signal receive A+
T1+	COM2 serial port RS422 signal transmit +
R2-/B2	COM2 serial port RS422 signal receive -	COM2 serial port RS485 signal receive B-
T2-	COM2 serial port RS422 signal transmit -
R2	COM2 serial port RS232 signal receive
T2	COM2 serial port RS232 signal transmit
GND	COM2 serial port RS232 signal GND
PE	Ground
R3+/A3	COM3 serial port RS422 signal receive +	COM3 serial port RS485 signal receive A+
T3+	COM3 serial port RS422 signal transmit +
R3-/B3	COM3 serial port RS422 signal receive -	COM3 serial port RS485 signal receive B-
T3-	COM3 serial port RS422 signal transmit -
R3	COM3 serial port RS232 signal receive
T3	COM3 serial port RS232 signal transmit
GND	COM3 serial port RS232 signal GND
PE	Ground
R4+/A4	COM4 serial port RS422 signal receive +	COM4 serial port RS485 signal receive A+
T4+	COM4 serial port RS422 signal transmit +
R4-/B4	COM4 serial port RS422 signal receive -	COM4 serial port RS485 signal receive B-
T4-	COM4 serial port RS422 signal transmit -
R4	COM4 serial port RS232 signal receive
T4	COM4 serial port RS232 signal transmit
GND	COM4 serial port RS232 signal GND
PE	Ground

COE General Parameter Description

Parameters

Description

2001:01 EtherCATBusErrCOMEN

The parameter is used to set whether the COM can transmit/receive data normally after the module communication is disconnected:

0: COM cannot transmit/receive data normally after ECT disconnection

1: COM can transmit/receive data normally after ECT disconnection

Parameter Description

SRE6002 and SRE6004 are modules with 2 and 4 serial ports respectively, and their parameter descriptions are the same. The following description takes SRE6004 as an example. The configuration of the SRE6002 can be performed accordingly. All parameter changes take effect immediately, without requiring power outage or restart, as shown below:

Parameters	Description
Duplex Mode	0: Full duplex (RS232/RS422) 1: Half duplex (RS485)
Baudrate	Baud rate: 0：1200 1：2400 2：4800 3：9600 4：19200 5：38400 6：57600 7：115200
Data Bit	Data bit: 0: 8-bit 1: 7-bit
Stop Bit	Stop bit: 0: 1-bit 1: 2-bit
Parity Bit	Parity bit: 0: No parity 1: Odd parity 2: Even parity
ReceiveTimeout	Serial port receive timeout: 5-200 (unit: ms) If the value is out of range, it shall be calculated as the maximum value, e.g., a value exceeding 200 is calculated as 200.
Modbus Master ResponseTimeout	Modbus RTU master mode response timeout If the slave station fails to respond within the set time, it is judged as a communication timeout 5-5000 (unit: ms) If the value is out of range, it shall be calculated as the maximum value, e.g., a value exceeding 5000 is calculated as 5000.
Modbus Master Scan Time	Modbus RTU master mode polling time The interval between the completion of one command and the next in MBS master mode Unit: ms

Configuration Module Description

Each serial port can be independently configured as Modbus master, Modbus slave, or free port; the Modbus master can be configured with a maximum of 32 modules, the Modbus slave can be configured with a maximum of 1 module, and the free port can be configured with a maximum of 1 module.

Modbus Master Configuration

In the Slot, select the module corresponding to the serial port, and add the module to be configured. For example, add "Read 32 Words 4xxxx" to Serial Port 1. Each serial port can be configured with a maximum of 32 modules under reasonable allocation, as shown below:

After configuration, add and refresh the IO to enable OP, as shown below:

Parameters	Description
State	Module status: 1: Communication Normal 2: Communication Timeout 3: CRC Error 4: Function Code or Address Error
Output Data	Output Address: Output Data 1~Output Data x
Slave ID	ID of the slave to be accessed
Addr	Address of the Modbus to be accessed

Parameters	Description
Input Data	Input address: Input Data 1~Input Data x
State	Module status: 1: Communication Normal 2: Communication Timeout 3: CRC Error 4: Function Code or Address Error
Slave ID	ID of the slave to be accessed
Addr	Address of the Modbus to be accessed

Modbus Slave Configuration

In the Slot, select the module corresponding to the serial port, and add the slave module to be configured. Each serial port can be configured with a maximum of 1 module. If more than 1 module is configured, OP will fail, as shown below:

After configuration, add and refresh the IO to enable OP, as shown below:

Parameters	Description
Input Datas：	Input Data 1~Input Data x The starting address of the data area that allows writing by the Modbus RTU master is 40256
Output Datas：	Output Data 1~Output Data x The starting address of the data area that allows reading by the Modbus RTU master is 40001
Slave ID：	ID of Local slave

Free Port Configuration

In the Slot, select the module corresponding to the serial port and add it. Each serial port can be configured with a maximum of 1 module. If more than 1 is configured, OP will fail, as shown below:

Input parameter description:

Parameters	Description
Status word meanings	Transmit Done: Current frame data transmission has been completed
	Receive request: New data is to be received
	Init accepted: Serial port reinitialization has been completed
	SndBuffer full: The sent frame length exceeds 1024
	PutData Done: Writing the sent data into the transmission buffer has been completed
	Input length: Current data reception length
	Total input length: Total length of data frame
Data In 0~Data In 31	Receive data buffer

Output parameter description:

Parameters	Description
Ctrl word meaning	Transmit request: a transmit request
	Receive accepted: Data has been received
	Init request: Reinitialize the serial port
	Put data: Write the sending data into the transmit buffer
	Output length: Total length of the transmitted data frame
Data Out 0~Data Out 31	Data transmission buffer

When performing the free port communication, it is recommended to initialize the serial port before receiving or transmitting data. After successful initialization, the initialization control word “Init request” shall be set to 0; otherwise, the serial port cannot transmit or receive data normally.

Transmit data:

(1) Initialize the serial port. When the control word “Init request” of COM1 is set to 1 and the status word “Init accepted” of COM1 displays 1, the initialization has been completed.

(2) Set the transmitted data length by writing 40 into the control word “Output length” of COM1.

(3) Write the data to be sent, from 1 to 32, into Output1~Output32 in sequence. (A maximum of 32 bytes of data can be written into the transmission buffer at a time. If the length of the data to be sent is greater than 32 bytes, the data needs to be written into the transmission buffer in batches and then sent out all at a time. For example, to transmit 40 bytes of data, write the data into the transmission buffer in two batches and then transmit all 40 bytes at a time.)

(4) Set the control word “Transmit request” of COM1 to 1, and simultaneously set the control word “Put data” to 1.

(5) Read the status word “PutData Done” of COM1. When PutData Done is 1, it indicates that 32 bytes have been successfully written into the transmission buffer. Then set the control word “Put data” to 0.

(6) Write data 33~40 into Output1~Output8, and then set the control word “Put data” to 1.

(7) When the status word “Transmit Done” of COM1 is 1, it indicates that the current data frame has been successfully sent. Then set the control words “Transmit request” and “Put data” to 0; the current frame transmission is completed.

Receive data:

(1) When the module is receiving data, the "Receive request" status word of COM2 is 1; Input length is 32, indicating that the currently receivable data is 32; Total input length displays a total length of 40;

(2) Reading Input1~Input32 allows access to the first 32 bytes. Set the control word “Receive accepted” of COM2 to 1. When the status word “Receive request” of COM2 is read as 0 at this time, set the control word “Receive accepted” of COM2 to 0. After setting it to 0, the status word “Receive request” of COM2 displays 1, and “Input length” shows 8, indicating there are 8 bytes of data to be received.

(3) At the moment, reading Input1~Input8 is to read the next 8 bytes. After reading, set the control word “Receive accepted” of COM2 to 1 and then to 0. After setting it to 0, the status word “Receive request” of COM1 displays 1. The current data frame reception is complete.

SRE6004 | 4 Channel Serial Communication Module

Overview