3.3 03 (0x03) Read Multiple Registers
This function code is used to read the current digital input counter value of the
tM module
.
Request
00
Address
1 Byte
1 ~ 247
01
Function code
1 Byte
0x03
02 ~ 03 Starting channel
numbers
2 Bytes 0x0000 ~ 0x001F
04 ~ 05 Input channel
number
2 Bytes 0x0001 ~ 0x0020
Response
00
Address
1 Byte
1 ~ 247
01
Function code
1 Byte
0x03
02
Byte count
1 Byte
1
03~
Input channel
counter value
*N x 2
Bytes
Each channel can record a maximum
counter value up to 65535 (0xFFFF).
*N = Number of input channels
Error Response
00
Address
1 Byte
1 ~ 247
01
Function code
1 Byte
0x83
02
Exception code
1 Byte
Refer to the Modbus standard for
more details.
Supported Modules
tM-P4C4:
Valid starting
channel
0x0000~0x0003 for DI counter value
tM-P8:
Valid starting
channel
0x0000~0x0007 for DI counter value
tM Series DIO User Manual, Rev: A1.3 7PH-013-A13
108
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