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Modbus/TCP & Modbus RTU Function Codes
Function Code 17 (11h) - Report HC900 ID
34 HC900 Hybrid Controller Communications User Guide Revision 4
9/03
Number of Records - 1 Byte unsigned value 00-FFh (byte 23)
Record Description:
Byte Description
00 Type of Data Element
(See Data Element Values Table Below)
01 Starting Address of Data Element Record (High)
02 Starting Address of Data Element Record (Low)
03 Number of Data Elements (High)
04 Number of Data Elements (Low)
Data Element Values Table:
Value Description
00 Analog Inputs
01 Not Applicable. Number of elements equals 0.
02 Discrete Inputs
03 Discrete Outputs
04 Control Loops
05 Set Point Programmers
06 Variables
07 Not applicable. Number of elements equals 0.
08 Not applicable. Number of elements equals 0.
09 Not applicable. Number of elements equals 0.
10 Schedulers
11 Tagged Signals
12 Tagged Signals List 2
13 Analog Inputs Accessed Using 3x Registers
14 Sequencers
15 Stage Groups
16 Ramp Groups
17 Hand Off Auto
18 Alternators
19 Device Controls
20 Control Loops Extended
21 Setpoint Programmers Extended
22 Schedulers Extended
23 Sequencers Extended