ICPDAS ECAT-2610 User Manual page 39

EtherCAT to Modbus RTU Gateway
01(0x01) Read the Status of the Coils (Readback DOs)
This function code is used to read either the current status of the coils or the current digital output
readback value.
[Request]
Byte Description
00
Net ID (Station Number)
01
Function Code
02-03
Starting DO Address
04-05
Number of Points (Channels)
[Response]
Byte Description
00 Net ID (Station Number)
01
Function Code
02
Byte Count
03 Data
[Error Response]
Byte Description
00 Net ID (Station Number)
01
Function Code
02 Exception Code
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Size
1 Byte 1 to 247
1 Byte 0x01
Refer to the Modbus address depends on your
slave device for more details.
2 Bytes
Byte 02 = high byte
Byte 03 = low byte
Byte 04 = high byte
2 Bytes
Byte 05 = low byte
Size
1 Byte 1 to 247
1 Byte 0x01
Byte Count of the Response
1 Byte
( n = (Points+7)/8 )
n= 1; Byte 03 = data bit 7 to 0
n= 2; Byte 04 = data bit 15 to 8
n Bytes
.......
n= m; Byte m+2 = data bit (8m-1) to 8(m-1)
Size
1 Byte 1 to 247
1 Byte 0x81
Refer to the Modbus Standard Specifications for
1 Byte
more details
Value
Value
Value
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