Mounting and Wiring

Parameter Name	Description	Value range	Instructions
Communication Mode	Communication mode	0	NoSelect: No selection
		1	Modbus RTU Master: RTU master station mode
		2	Modbus RTU Slave: RTU slave station mode
		3	Modbus ASCII Master: ASCII master station mode
		4	Modbus ASCII Slave: ASCII slave station mode
		5	FP_Request: freeport request mode
		6	FP_Input_Output: freeport input/output mode
		7	FP_Input: freeport input mode
		8	FP_Output: freeport output mode
		9	SetPDOLength32Bytes
		10	SetPDOLength64Bytes
		11	SetPDOLength128Bytes
		12	SetPDOLength255Bytes
Baud Rate	Serial port baud rate	0	1200 bps
		1	2400 bps
		2	4800 bps
		3	9600 bps
		4	19200 bps
		5	38400 bps
		6	57600 bps
		7	115200 bps
Stop Bit	Stop bit	0	1 Bit
		1	2 Bits
Word Format	Word format	0	8 Bits
		1	7 Bits
Parity	Parity bit	0	Parity None
		1	Parity Odd
		2	Parity Even
Control Mode	Control and Status Mode	0	Disable: control and status disabled
		1	Level: control and status enabled - high level triggered
		2	Rising Edge: control and status enabled - rising edge triggered
Node Output Mode	Node output mode	0	Poll: polling
		1	Change Trigger
Communication Error Behavior	Communication error behavior	0	Clear
		1	Hold
Respond Timeout	Response time	5~3000	Unit: ms, default 50
Poll Delay	Polling delay	5~3000	Unit: ms, default 10
Slave ID	Modbus slave station number	1~247	Valid in slave station mode, default is 1
Slave Respond Delay	Slave station response delay	0~3000	Unit: ms, default 50
Frame Interval	Frame interval	0	1.5T
		1	3.5T
		2	5T
		3	10T
		4	20T
		5	50T
		6	100T
		7	200T
Node_1_Param_01	Node 1 Parameter 1	0~FFFFFFFF	The default value is 0. For details, see Node Code Parameters
Node_1_Param_02	Node 1 Parameter 2	0~FFFFFFFF	The default value is 0. For details, see Node Code Parameters
…	…	…	…
Node_16_Param_01	Node 16 Parameter 1	0~FFFFFFFF	The default value is 0. For details, see Node Code Parameters
Node_16_Param_02	Node 16 Parameter 2	0~FFFFFFFF	The default value is 0. For details, see Node Code Parameters

 

---

Node Code Parameter

Modbus Master Station Function

In Modbus master mode, parameter 1 (Param_01) consists of a 2-byte start address parameter and a 2-byte node code parameter, and parameter 2 (Param_02) consists of a 2-bit byte exchange parameter and a 1-byte slave station number parameter.

Param_01
BIT31~BIT16	BIT15~BIT0
Start Address	Node Code See Modbus Master Station Node Code
Param_02
BIT31~BIT16	BIT15~BIT10	BIT9~BIT8	BIT7~BIT0
Reserve		See Byte ExchangeExByte Flag	Slave Station Number

Note: The start address parameter range is 0000~FFFFH, and the slave station number parameter range is 1~247.

 

Modbus Mmaster Sstation Ffunction Nnode Ccode

SubModule grouping	SubModule	SubModule ID（10#）	SubModule ID（16#）
Modbus Master Read Coilsi.e., Modbus master reads coils	Read 8 bits	257	0x0101
	Read 16 bits	258	0x0102
	Read 24 bits	259	0x0103
	Read 32 bits	260	0x0104
	Read 40 bits	261	0x0105
	Read 48 bits	262	0x0106
	Read 56 bits	263	0x0107
	Read 64 bits	264	0x0108
	Read 72 bits	265	0x0109
	Read 80 bits	266	0x010A
	Read 88 bits	267	0x010B
	Read 96 bits	268	0x010C
	Read 104 bits	269	0x010D
	Read 112 bits	270	0x010E
	Read 120 bits	271	0x010F
	Read 128 bits	272	0x0110
Modbus Master Read Discretei.e., Modbus master reads discrete inputs	Read 8 bits	513	0x0201
	Read 16 bits	514	0x0202
	Read 24 bits	515	0x0203
	Read 32 bits	516	0x0204
	Read 40 bits	517	0x0205
	Read 48 bits	518	0x0206
	Read 56 bits	519	0x0207
	Read 64 bits	520	0x0208
	Read 72 bits	521	0x0209
	Read 80 bits	522	0x020A
	Read 88 bits	523	0x020B
	Read 96 bits	524	0x020C
	Read 104 bits	525	0x020D
	Read 112 bits	526	0x020E
	Read 120 bits	527	0x020F
	Read 128 bits	528	0x0210
Modbus Master Read Holdi.e., Modbus master reads holding registers	Read 1 Reg	769	0x0301
	Read 2 Regs	770	0x0302
	Read 3 Regs	771	0x0303
	Read 4 Regs	772	0x0304
	Read 5 Regs	773	0x0305
	Read 6 Regs	774	0x0306
	Read 7 Regs	775	0x0307
	Read 8 Regs	776	0x0308
	Read 9 Regs	777	0x0309
	Read 10 Regs	778	0x030A
	Read 11 Regs	779	0x030B
	Read 12 Regs	780	0x030C
	Read 13 Regs	781	0x030D
	Read 14 Regs	782	0x030E
	Read 15 Regs	783	0x030F
	Read 16 Regs	784	0x0310
Modbus Master Read Inputi.e., Modbus master reads input registers	Read 1 Reg	1025	0x0401
	Read 2 Regs	1026	0x0402
	Read 3 Regs	1027	0x0403
	Read 4 Regs	1028	0x0404
	Read 5 Regs	1029	0x0405
	Read 6 Regs	1030	0x0406
	Read 7 Regs	1031	0x0407
	Read 8 Regs	1032	0x0408
	Read 9 Regs	1033	0x0409
	Read 10 Regs	1034	0x040A
	Read 11 Regs	1035	0x040B
	Read 12 Regs	1036	0x040C
	Read 13 Regs	1037	0x040D
	Read 14 Regs	1038	0x040E
	Read 15 Regs	1039	0x040F
	Read 16 Regs	1040	0x0410
Modbus Master Write Coilsi.e., Modbus master writes coils	Write 8 bits	1281	0x0501
	Write 16 bits	1282	0x0502
	Write 24 bits	1283	0x0503
	Write 32 bits	1284	0x0504
	Write 40 bits	1285	0x0505
	Write 48 bits	1286	0x0506
	Write 56 bits	1287	0x0507
	Write 64 bits	1288	0x0508
	Write 72 bits	1289	0x0509
	Write 80 bits	1290	0x050A
	Write 88 bits	1291	0x050B
	Write 96 bits	1292	0x050C
	Write 104 bits	1293	0x050D
	Write 112 bits	1294	0x050E
	Write 120 bits	1295	0x050F
	Write 128 bits	1296	0x0510
	Write Single bit	1535	0x05FF
Modbus Master Write Holdi.e., Modbus master writes holding registers	Write 1 Reg	1537	0x0601
	Write 2 Regs	1538	0x0602
	Write 3 Regs	1539	0x0603
	Write 4 Regs	1540	0x0604
	Write 5 Regs	1541	0x0605
	Write 6 Regs	1542	0x0606
	Write 7 Regs	1543	0x0607
	Write 8 Regs	1544	0x0608
	Write 9 Regs	1545	0x0609
	Write 10 Regs	1546	0x060A
	Write 11 Regs	1547	0x060B
	Write 12 Regs	1548	0x060C
	Write 13 Regs	1549	0x060D
	Write 14 Regs	1550	0x060E
	Write 15 Regs	1551	0x060F
	Write 16 Regs	1552	0x0610
	Write Single Reg	1791	0x06FF

 

Modbus Slave Station Function

In Modbus slave station mode, parameter 1 (Param_01) consists of a 2-byte start address parameter and a 2-byte node code parameter, and parameter 2 (Param_02) consists of a 2-bit byte exchange parameter.

Param_01
BIT31~BIT16	BIT15~BIT0
Start Address	Node Code See Modbus Slave Station Node Code
Param_02
BIT31~BIT16	BIT15~BIT2	BIT1~BIT0
Reserve		See Byte ExchangeExByte Flag

Note: The start address parameter range is 0000~FFFFH

Modbus Sslave Sstation Ffunction Nnode Ccode

SubModule grouping	SubModule	SubModule ID（10#）	SubModule ID（16#）
Modbus Slave Read Coilsi.e., Modbus slave reads coils	Read 8 bits	1793	0x0701
	Read 16 bits	1794	0x0702
	Read 24 bits	1795	0x0703
	Read 32 bits	1796	0x0704
	Read 40 bits	1797	0x0705
	Read 48 bits	1798	0x0706
	Read 56 bits	1799	0x0707
	Read 64 bits	1800	0x0708
	Read 72 bits	1801	0x0709
	Read 80 bits	1802	0x070A
	Read 88 bits	1803	0x070B
	Read 96 bits	1804	0x070C
	Read 104 bits	1805	0x070D
	Read 112 bits	1806	0x070E
	Read 120 bits	1807	0x070F
	Read 128 bits	1808	0x0710
Modbus Slave Read Holdi.e., Modbus slave reads holding registers	Read 1 Reg	2049	0x0801
	Read 2 Regs	2050	0x0802
	Read 3 Regs	2051	0x0803
	Read 4 Regs	2052	0x0804
	Read 5 Regs	2053	0x0805
	Read 6 Regs	2054	0x0806
	Read 7 Regs	2055	0x0807
	Read 8 Regs	2056	0x0808
	Read 9 Regs	2057	0x0809
	Read 10 Regs	2058	0x080A
	Read 11 Regs	2059	0x080B
	Read 12 Regs	2060	0x080C
	Read 13 Regs	2061	0x080D
	Read 14 Regs	2062	0x080E
	Read 15 Regs	2063	0x080F
	Read 16 Regs	2064	0x0810
Modbus Slave Write Coilsi.e., Modbus slave writes coils	Write 8 bits	2305	0x0901
	Write 16 bits	2306	0x0902
	Write 24 bits	2307	0x0903
	Write 32 bits	2308	0x0904
	Write 40 bits	2309	0x0905
	Write 48 bits	2310	0x0906
	Write 56 bits	2311	0x0907
	Write 64 bits	2312	0x0908
	Write 72 bits	2313	0x0909
	Write 80 bits	2314	0x090A
	Write 88 bits	2315	0x090B
	Write 96 bits	2316	0x090C
	Write 104 bits	2317	0x090D
	Write 112 bits	2318	0x090E
	Write 120 bits	2319	0x090F
	Write 128 bits	2320	0x0910
Modbus Slave Write Discretei.e., Modbus slave writes discrete input	Write 8 bits	2561	0x0A01
	Write 16 bits	2562	0x0A02
	Write 24 bits	2563	0x0A03
	Write 32 bits	2564	0x0A04
	Write 40 bits	2565	0x0A05
	Write 48 bits	2566	0x0A06
	Write 56 bits	2567	0x0A07
	Write 64 bits	2568	0x0A08
	Write 72 bits	2569	0x0A09
	Write 80 bits	2570	0x0A0A
	Write 88 bits	2571	0x0A0B
	Write 96 bits	2572	0x0A0C
	Write 104 bits	2573	0x0A0D
	Write 112 bits	2574	0x0A0E
	Write 120 bits	2575	0x0A0F
	Write 128 bits	2576	0x0A10
Modbus Slave Write Holdi.e., Modbus slave writes holding register	Write 1 Reg	2817	0x0B01
	Write 2 Regs	2818	0x0B02
	Write 3 Regs	2819	0x0B03
	Write 4 Regs	2820	0x0B04
	Write 5 Regs	2821	0x0B05
	Write 6 Regs	2822	0x0B06
	Write 7 Regs	2823	0x0B07
	Write 8 Regs	2824	0x0B08
	Write 9 Regs	2825	0x0B09
	Write 10 Regs	2826	0x0B0A
	Write 11 Regs	2827	0x0B0B
	Write 12 Regs	2828	0x0B0C
	Write 13 Regs	2829	0x0B0D
	Write 14 Regs	2830	0x0B0E
	Write 15 Regs	2831	0x0B0F
	Write 16 Regs	2832	0x0B10
Modbus Slave Write Inputi.e., Modbus slave writes input register	Write 1 Reg	3073	0x0C01
	Write 2 Regs	3074	0x0C02
	Write 3 Regs	3075	0x0C03
	Write 4 Regs	3076	0x0C04
	Write 5 Regs	3077	0x0C05
	Write 6 Regs	3078	0x0C06
	Write 7 Regs	3079	0x0C07
	Write 8 Regs	3080	0x0C08
	Write 9 Regs	3081	0x0C09
	Write 10 Regs	3082	0x0C0A
	Write 11 Regs	3083	0x0C0B
	Write 12 Regs	3084	0x0C0C
	Write 13 Regs	3085	0x0C0D
	Write 14 Regs	3086	0x0C0E
	Write 15 Regs	3087	0x0C0F
	Write 16 Regs	3088	0x0C10

Byte Eexchange

Byte number	Function	Length
0	Do not exchange	2 Bits
1	2Bytes Exchange	2 Bits
2	4Bytes Register Exchange	2 Bits
3	4Bytes Big-Little-Endian Exchange	2 Bits

Freeport Function

In Freeport mode, parameter 1 (Param_01) is a 2-byte node code parameter. 

Param_01
BIT31~BIT16	BIT15~BIT0
Reserve	Node Code See Freeport Node Code
Param_02
BIT31~BIT0
Reserve

Freeport Ffunction Nnode Ccode 

SubModule grouping	SubModule	SubModule ID（10#）	SubModule ID（16#）
Freeport Input	Input 1 byte	3329	0x0D01
	Input 2 bytes	3330	0x0D02
	Input 4 bytes	3331	0x0D03
	Input 8 bytes	3332	0x0D04
	Input 16 bytes	3333	0x0D05
	Input 32 bytes	3334	0x0D06
	Input 64 bytes	3335	0x0D07
	Input 128 bytes	3336	0x0D08
	Input 160 bytes	3337	0x0D09
	Input 192 bytes	3338	0x0D0A
	Input 224 bytes	3339	0x0D0B
	Input 255 bytes	3340	0x0D0C
Freeport Output	Output 1 byte	3585	0x0E01
	Output 2 bytes	3586	0x0E02
	Output 4 bytes	3587	0x0E03
	Output 8 bytes	3588	0x0E04
	Output 16 bytes	3589	0x0E05
	Output 32 bytes	3590	0x0E06
	Output 64 bytes	3591	0x0E07
	Output 128 bytes	3592	0x0E08
	Output 160 bytes	3593	0x0E09
	Output 192 bytes	3594	0x0E0A
	Output 224 bytes	3595	0x0E0B
	Output 255 bytes	3596	0x0E0C
Freeport Parity	CRC8	3841	0x0F01
	CRC16	3842	0x0F02
	XOR	3843	0x0F03
	SUM8	3844	0x0F04
	LRC	3845	0x0F05

 

Control and Status Node Code

When the configuration parameter Control Mode is set to disable, the control and status node code does not need to be configured; When the configuration parameter Control Mode is set to Level or Rising Edge, the node code must be configured in node 1 parameter 1 (Node\_1\_Param\_01).

The node code is shown in the following table:

SubModule grouping	SubModule	SubModule ID（10#）	SubModule ID（16#）	Remarks
Control&Status	1 Node	1	0x0001	Configure in Master Mode
	2 Node	2	0x0002
	3 Node	3	0x0003
	4 Node	4	0x0004
	5 Node	5	0x0005
	6 Node	6	0x0006
	7 Node	7	0x0007
	8 Node	8	0x0008
	9 Node	9	0x0009
	10 Node	10	0x000A
	11 Node	11	0x000B
	12 Node	12	0x000C
	13 Node	13	0x000D
	14 Node	14	0x000E
	15 Node	15	0x000F
	Freeport Req	32	0x0020	Configure in Freeport Mode
	Freeport Input_Output	33	0x0021
	Freeport Input	34	0x0022
	Freeport Output	35	0x0023
	Modbus Slave	48	0x0030	Configure in Slave Mode

Process Ddata

The module factory default is SRR6001-32Bytes, and the uplink and downlink data lengths are 32Bytes each. When the PDO data volume generated by the module's communication node parameter configuration reaches a certain range (either the uplink data size or the downlink data size reaches the range limit), the coupler module will alarm 0x5002. Manually switch the corresponding PDO data length, re-power on and scan the module. For detailed steps, see Example of Switching PDO Data Length. (Users are advised to estimate PDO data length in advance and switch accordingly)

Module PDO length range and model matching table:

Module PDO length range and model matching table
Module model	Uplink data length (Bytes)	Downlink data length (Bytes)
SRR6001-32Bytes	0~32	0~32
SRR6001-64Bytes	33~64	33~64
SRR6001-128Bytes	65~128	65~128
SRR6001-255Bytes	129~255	129~255

 The following uses model SRR6001-32Bytes as an example to explain configuration parameters.

When the configuration parameter Control Mode is set to disable, the uplink and downlink process data are shown in the table below. 

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Input data	Serial communication module input data	32 bytes
2	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Output data	Serial communication module output data	32 bytes
2	Output data
…	…
32	Output data

When the configuration parameter Control Mode is set to Level or Rising Edge, the uplink and downlink process data are shown in the following table.

Modbus master station process data 

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Status word	Bit0: Idle status	1 byte
		Bit1: busy status, indicating data transmission in progress
		Bit2: completion status, indicating data transmission finished
2	Alarm code	See Alarm Code	1 byte
3	Input data	Serial communication module input data	The last 30 bytes
4	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	When the configuration parameter Control Mode is set to Level, set 1 to transmit data	1 byte
		When the configuration parameter Control Mode is set to Rising Edge, transmit data on 0->1
2	Output data	Serial communication module output data	The last 31 bytes
3	Output data
…	…
32	Output data

 Note: The process data in the above table is configured for 1 node in Level or Rising Edge mode. If two nodes are configured, byte numbers 1 and 2 of the uplink data represent the status bits and alarm codes of node 1, and byte numbers 3 and 4 represent those of node 2, with the remaining bytes being data bits. For downlink data, byte number 1 is the control bit for node 1, byte number 2 is the control bit for node 2, and the remaining bytes are data bits. A maximum of 15 nodes can be configured. 

Modbus Slave Station Process Data

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Alarm code	See Alarm Code	1 byte
2	Input data	Serial communication module input data	The last 31 bytes
3	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	Bit0: Alarm code clear	1 byte
2	Output data	Serial communication module output data	The last 31 bytes
3	Output data
…	…
32	Output data

 

Freeport_Request Process Data 

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Status word	Bit0: Idle status	1 byte
		Bit1: busy status, indicating data transmission in progress
		Bit2: completion status, indicating data transmission finished
2	Alarm code	Bit0: Received data length error	1 byte
		Bit1: Check error
		Bit2: Timeout error
3	Receive data length	0~255	1 byte
4~5	Receive abnormal count	0~65535	2 bytes
6~7	Receive data count	0~65535	2 bytes
8	Input data	Serial communication module input data	The last 25 bytes
9	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	Bit0: Enable	1 byte
		Bit1: Status word clear
		Bit2: Clear received data
2	Transmit data length	0~255	1 byte
3	Count clear	Bit0: Clear abnormal counting received	1 byte
		Bit1: Clear data counting received
		Bit2: Clear data length received
4	Clear error code	Bit0: Clear abnormal length	1 byte
		Bit1: Clear check error
		Bit2: Clear timeout error
5	Output data	Serial communication module output data	The last 28 bytes
6	Output data
…	…
32	Output data

 

Freeport_Input Process Data 

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Alarm code	Bit0: Received data length error	1 byte
		Bit1: Check error
2	Receive data length	0~255	1 byte
3~4	Receive abnormal count	0~65535	2 bytes
5~6	Receive data count	0~65535	2 bytes
7	Input data	Serial communication module input data	The last 26 bytes
8	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	Bit0: Enable	1 byte
		Bit1: Status word clear
		Bit2: Clear received data
2	Count clear	Bit0: Clear abnormal counting received	1 byte
		Bit1: Clear data counting received
		Bit2: Clear data length received
3	Clear error code	Bit0: Clear length error received	1 byte
		Bit1: Clear check error
4	Output data	Serial communication module output data	The last 29 bytes
5	Output data
…	…
32	Output data

 

Freeport_Output Process Data 

Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	Bit0: Enable	1 byte
2	Transmit data length	0~255	1 byte
3	Output data	Serial communication module output data	The last 30 bytes
4	Output data
…	…
32	Output data

 

Freeport_Input_Output Process Data

Uplink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Alarm code	Bit0: Received data length error	1 byte
		Bit1: Check error
2	Receive data length	0~255	1 byte
3~4	Receive abnormal count	0~65535	2 bytes
5~6	Receive data count	0~65535	2 bytes
7	Input data	Serial communication module input data	The last 26 bytes
8	Input data
…	…
32	Input data
Downlink data (32 bytes)
Byte number	Function	Meaning	Address range
1	Control word	Bit0: Enable	1 byte
		Bit1: Status word clear
		Bit2: Clear received data
2	Transmit data length	0~255	1 byte
3	Count clear	Bit0: Clear abnormal counting received	1 byte
		Bit1: Clear data counting received
		Bit2: Clear data length received
4	Clear error code	Bit0: Clear length error received	1 byte
		Bit1: Clear check error
5	Output data	Serial communication module output data	The last 28 bytes
6	Output data
…	…
32	Output data

 

Modbus alarm code

Fault code	Notes
0x00	No error
0x01	Slave device address error
0x02	Function code error
0x03	CRC check error
0x04	Response byte count error
0x05	Coil register data error
0x06	Holding register data error
0x07	Illegal data address
0x08	Slave device failure
0x09	LRC check error
0x0C	Data length error
0x0D	Data conversion error
0x0E	ASCII frame error
0x0F	Response timeout