Honeywell HC900 User Manual
Page 73
Revision 10
HC900 Hybrid Controller Communications User Guide
65
12/07
Example
Query: Read Signal Tags 3 and 4 from HC900 at address 1 using Function Code 3 (hex codes).
TCP:
00 03 20 04 00 04
RTU:
01 03 20 04 00 04 CRC
CRC
Response: from HC900 where Signal Tag 3 = 100.0 and Signal Tag 4 = 55.32
TCP:
00 03 08 42 C8 00 00 42 5D 47
AE
RTU:
01 03 08 42 C8 00 00 42 5D 47
AE CRC
CRC