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iNS-316 User Manual
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2022 ICP DAS CO., Ltd. All Rights Reserved.
- 47 -
7.2.2 02(0x02) Read the Status of the Input (Read DI values)
This function code is used to read the current Digital Input value from the iNS-316
[Request]
Byte
Description
Size
Value
00
Net ID (Station Number)
1 Byte
1 to 247
01
Function Code
1 Byte
0x02
02-03
Starting DI Address
2 Byte
Byte 02 = high byte
Byte 03 = Low byte
04-05
Number of Points (Channels) 2 Byte
Byte 04 = high byte
Byte 05 = Low byte
[Response]
Byte
Description
Size
Value
00
Net ID (Station Number)
1 Byte
1 to 247
01
Function Code
1 Byte
0x02
02
Byte Count
1 Byte
Byte Count of the Response
( n = (7)/8 )
03
Data
n Byte
n= 1; Byte 03 = data bit 7 to 0
n= 2; Byte 04 = data bit 15 to 8
.......
n= m; Byte m+2 = data bit (8m-1) to 8(m-1)
[Error Response]
Byte
Description
Size
Value
00
Net ID (Station Number)
1 Byte
1 to 247
01
Function Code
1 Byte
0x82
02
Exception Code
1 Byte
Refer to the Modbus Standard
Specifications for more details