GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 81
Figure 76 Send Modbus command to read DI of the GW-7553 and receive data
(0xFE, 0xDC)
PS:
Modbus command:
Query message
DA
FC
SA
(Hi)
SA
(Lo)
NO
(Hi)
NO
(Lo)
CRC
check
01
02
00
00
00
10
79
C6
Response message
DA
FC
BC
DATA
CRC
check
01
02
02
FE
DC
F8
41