0X04) Read The Input Registers (Read Ai Values) - ICPDAS ET-2268 CR User Manual

ET-2200 Series Ethernet I/O Modules
6.2.4

04(0x04) Read the Input Registers (Read AI values)

This function code is used to read either the input registers or the current analog input value from
the ET-2200 series module. These registers are also used to store the current value for the digital
counter, the number of DI channels and the number of DO channels, etc.
[Request]
Byte Description
00 Net ID (Station Number)
01 Function Code
02-03 Starting AI Address
Number of 16-bit Registers
04-05
(Channels)
[Response]
Byte Description
00 Net ID (Station Number)
01 Function Code
02 Byte Count
03~ Register Values
[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 0x04
Refer to Section
Table" to find the address.
2 Bytes
Byte 02 = high byte
Byte 03 = low byte
Word Count
2 Bytes Byte 04 = high byte
Byte 05 = low byte
Size
1 Byte 1 to 247
1 Byte 0x04
Byte Count of the Response
1 Byte
(n=Points x 2 Bytes)
Register Values
n= 2; Byte 03 = high byte
Byte 04 = low byte
n Bytes
.......
n= m; Byte m+1 = high byte
Byte m+2 = low byte
Size
1 Byte 1 to 247
1 Byte 0x84
Refer to the Modbus Standard Specifications
1 Byte
for more details.
Value
6.3 or 6.4 "Modbus Register
Value
Value
-145 -