Honeywell HC900 User Manual page 60

Parameters accessible with Function Code 03, 06,10h
Loop Values
Examples for loop queries using Function Codes 3, 6, 16
Example 1
Query: Read PV, Remote SP, Working SP, Output for Loop 1 from HC900 at slave address 01 using Function
Code 3 (hex codes). This will be accomplished by accessing contiguous registers.
TCP:
00 03
RTU:
01 03
Response: where PV=1000.0, Remote SP=1000.0, Working SP=1000.0, Output=50.0
TCP:
00 03 10 44
RTU:
01 03 10 44 7A
Example 2:
Query: Write a Local Setpoint , (address 006A) to 100.0 for loop 1 at HC900 at slave address 01 using Function
Code 16 (10 hex). Function code 16 is used for presetting multiple registers. Registers are addressed
starting at zero: Register 1 is addressed as 0.
TCP:
00 10
RTU:
01 10
Response: from preset of LSP#1, address 006A to 100.0.
TCP:
00 10
RTU:
01 10
Example 3:
Query: Using Function code 6, set Loop #1 to Auto (register 00FA hex) at controller at slave address 01. This is
a bit-packed single register data type. Registers are addressed starting at 0: Register 1 is addressed as 0.
TCP:
00 06 00
RTU:
01 06 00
52
00 40 00
00 40 00
7A 00 00 44 7A
00 00 44 7A 00
00 6A 00
00 6A 00 02
00 6A 00
00 6A 00
FA 00 01
FA 00 01
HC900 Process Controller Communications User Guide
08
08 CRC CRC
00 00 44 7A
00 44 7A 00 00
02 04 42
04 42 C8
02
02 CRC CRC
CRC CRC
00 00 42 48 00
42 48 00 00
C8 00 00
00 00 CRC
00
CRC CRC
CRC
Revision 13
April 2017