0X01) Read The Status Of The Coils (Read Do Readback Vaslues) - ICP DAS USA iNS-308 User Manual

iNS-308 User Manual
7.2.1 01(0x01) Read the Status of the Coils
(Read DO Readback vaslues)
This function code is used to read either the current status of the coils or the current Digital Output
readback value from the iNS-308
[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
Byte 02 = high byte
2 Byte
Byte 03 = Low byte
Byte 04 = high byte
2 Byte
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 Byte
.......
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
1 Byte
Specifications for more details
Value
Value
Value
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