ICP DAS USA GW-7552-B User Manual page 52

Figure 49 Send Modbus command to read DI of the GW-7552-B /
and receive data (0xFE, 0xDC)
PS:
Modbus command:
Query message
DA
01
Response message
DA
01
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 52
SA SA
FC
(Hi) (Lo)
02 00 00
FC BC DATA
02 02 FE
NO NO
(Hi) (Lo)
00 10 79
CRC
check
DC F8 41
CRC
check
C6