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CRC
*N = Quantity of Registers
Error
Modbus ID (Slave Address)
Error Code
Exception Code
CRC
06 (0
06) W
S
X
RITE
INGLE
This function code is used to write a single holding register in a remote device.
The Request Protocol Data Unit specifies the address of the register to be written. Registers are addressed
starting at zero. Therefore register number 1 is addressed as 0.
The normal response is an echo of the request, returned after the register contents have been written.
Request
Modbus ID (Slave Address)
Function code
Register Address
Register Value
CRC
Response
Modbus ID (Slave Address)
Function code
Register Address
Register Value
CRC
*N = Quantity of Registers
Error
Modbus ID (Slave Address)
Error Code
Exception Code
CRC
R
EGISTERS
Per the Modbus Application Protocol Specification (V1.1b)
Name
Modbus ID (slave address)
Data Format
Baud Rate
BusMessage
BusCommunicationsError
Page 45
2 Bytes
1 Byte
1 Byte
1 Byte
2 Bytes
R
EGISTER
1 Byte
1 Byte
2 Bytes
2 Bytes
2 Bytes
1 Byte
1 Byte
2 Bytes
2 Bytes
2 Bytes
1 Byte
1 Byte
1 Byte
2 Bytes
Meaning (2 bytes each register)
Defined as 1 to 247 per the Modbus Application
Protocol Specification (V1.1b)
Data Format of the User Bus to the T80 (0-DF8N2, 1-
DF8O1, 2-DF8E1, 3-DF8N1)
Baud Rate of the User Bus to the T80 (0-1200, 1-
2400, 2-4800, 3-9600)
total message count detected by the slave (remote
device)
total CRC error count
calculated
1 to 247 (0x01 to 0xF7)
0x86
01, 02, 03 or 04
calculated
1 to 247 (0x01 to 0xF7)
0x06
0x0000 to 0xFFFF
0x0000 to 0xFFFF
calculated
1 to 247 (0x01 to 0xF7)
0x06
0x0000 to 0xFFFF
0x0000 to 0xFFFF
calculated
1 to 247 (0x01 to 0xF7)
0x86
01, 02, 03 or 04
calculated
Number
of
Registers
1
1
1
1
1
Return
Read
Requires
Data
Write
Storage
Format
Initiate
16 bit
RW
Integer
16 bit
RW
Integer
16 bit
RW
Integer
16 bit
R
Integer
16 bit
R
Integer
Model TC80
Register #
dec
hex
0
00
1
01
2
02
3
03
4
04
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