6-channel PT100PT1000 to RS485 serial thermal resistance temperature isolation acquisition transmitter module RS485 to MODBUS

System transmission accuracy:±0.2%×F·S

Working temperature:0~60

Current output allows external loadimpedance:

485 communication

Power supply:DC: DCtwenty fourV±10% V; or customized 12VDC and other power supplies

Dimensions:35mm standard guide rail..73mm wide*125mm high*43mm deep

Input signal type

Thermal resistance: Pt100 standard

Pt1000Other inputs,Thermocouple:K,E,S,B,J,R,N,T

This communication protocol adopts the standard Modbus protocol, and the transmission mode used isRTUmode.ModbusAgreement is a master-Follow-up agreement.

Only one device can send on the wire at any time.The information exchange is managed by the master station, and only it can initiate it. It will poll the slaves one after another. Unless approved by the master station, no slave station can send messages. Direct communication between slave stations is not possible.

The protocol frame does not contain any message header byte or message byte terminator.

It is defined as follows:

Slave address:-Address must be at1To247between.

-Each address must be unique in the network device environment.

Data: Transmitted in binary code.

CRC16: Cyclic redundancy check parameters.

When the interval time is longer than or equal to3.5When the character is detected, it is regarded as the end of the frame detected.

1, Communication port settings

communication methodAsynchronous serial communication interface, such asRS-485,RS-232,RS-422Wait

Baud rate2400, 4800,9600, 19200bps(The instrument parameters can be changed mutually, the default is 9600)

2, Byte data format

.A start bit

.Eight data bits

.One stop bit

.No verification

1start bit8 data bits1stop bit

3. Instrument communication frame format

The following table is given byWhen the company's digital display is working in slave modeofModbusFunction and specify its limit.

Slave number:NativeInstrument address,Address must be at1To247The address of each instrument on the same bus cannot be repeated.

When the address is 0, it is used for the broadcast function, and only the write function is valid at this time. Single byte.

Function code:The "read" and "write" functions are defined from the perspective of the master. Single byte.

First register address:The address of the first internal register to be read. Double byte.EachInternal registerThe value data of is double bytes.

Number of registers:The number of internal registers to be read or modified. Double byte.

Number of bytes read:The total number of bytes of internal register data read. Single byte.

CRC16:Cyclic redundancy check parameters.

1)readNOutput words: function3

note:Hi=High byte,Lo =Low byte.

This function can be used to read parameters regardless of the type.

Master request

1byte1byte2byte2byte2byte

Slave response

1byte1byte1byte2byte2byte2byte

example1:Use function3Read slave1Up1Words (address0003H,See Schedule)

Master request

1byte1byte2byte2byte2byte

Slave response

1byte1byte1byte2byte2byte

2)Write 1 output word: function 06(0x06)

Standard modbus write instructions

3)Abnormal response

When the slave cannot perform the request sent to it, it will return an exception response.

The format of the exception response:

1byte1byte1byte2byte

Response code:Function code requested+0x80(The highest bit is set to1). (Read: 0x83; write 0x90)

error code:

1 =The register address to be accessed in the request is not within the register address range.

2=The data exceeds the maximum value. (Shaping start address+Max11; Floating point is5)

3=The slave station is write-protected, and the LCK flag bit needs to be modified to unlock it.

4=The data exceeds the data range.

meterCorresponding address table of internal parameters (range: 0--161):

The address table corresponding to the internal
parameters of the instrument (range: 0--27)：

No.	Parameter symbols	parameter name	Register address	Data type	Type	Value range
1	NAME	Manufacturer code	0x0000 0	2 bytes unsigned	Read only		Spare
2	INP	Measurement type	0x0001 1	2 bytes unsigned	Read/Write		Pt100 为9，不可修改
3	DP	Spare	0x0002 2	2 bytes unsigned	Read/Write	1
4	PS1	Channel 1 offset	0x0003 3	2 bytes unsigned	Read/Write	-1999～9999
5	PS2	Channel 2 offset	0x0004 4	2 bytes unsigned	Read/Write	-1999～9999
6	PS3	Channel 3 offset	0x0005 5	2 bytes unsigned	Read/Write	-1999～9999
7	PS4	Channel 4 offset	0x0006 6	2 bytes signed	Read/Write	-1999～9999
8	PS5	Channel 5 offset	0x0007 7	2 bytes signed	Read/Write	-1999～9999
9	PS6	Channel 6 offset	0x0008 8	2 bytes signed	Read/Write	-1999～9999
10	K1	Channel 1 coefficient	0x0009 9	2 bytes signed	Read/Write	10~9000	1000 corresponds to 1.000
11	K2	Channel 2 coefficient	0x000A 10	2 bytes signed	Read/Write	10~9000
12	K3	Channel 3 coefficient	0x000B 11	2 bytes signed	Read/Write	10~9000
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