ICP DAS USA GW-7553-B User Manual page 88

Figure 85 Send Modbus command (output data: 0xFF, 0xFF)
Figure 86 Receive "0xFF" in the input data area
Table 25 Receive "0xFF" in the input data area
Module
Input module
PS:
Modbus command:
Query message
DA
01
GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 88
Byte
Input 6
Input 7
SA SA
FC
(Hi) (Lo)
0F 00 00
Data type Representation
Byte Hex
Byte Hex
NO NO
BC
(Hi) (Lo)
00 10 02
Value
0xFF
0xFF
DATA
FF FF