14 hand/off/auto control – Honeywell HC900 User Manual

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Revision 10

HC900 Hybrid Controller Communications User Guide

12/07

6.14 Hand/OFF/Auto Control

Summary

This table contains Hand/Off/Auto Map addresses of HOA #1.

See the HOA Register Maps Table 6-1 for starting and ending addresses (hex) for Hand/Off/Auto #2
through Hand/Off/Auto #16 Map Addresses.

The Modbus HOA number address for a HOA can also be obtained from the Hybrid Control Designer
printout of "Block Modbus Addresses".

Function Code Support:

Reads – Function Code 3

Writes – Function Code 16 (10 hex) for preset of multiple registers (e.g., for floating point)

Writes – Function Code 6 for presetting an integer value

For custom addresses view or print a report in HC Designer.

Table 6-24 HOA Control Parameters

Fixed
Address
(hex)

Fixed
Register
(decimal)

Parameter Name

Access Notes

6600 26113 Status

Bit

Packed

Bits 0 – 3: Hand-Off-Auto State

Bit 0: Off : 0=NO, 1=YES

Bit 1: Hand: 0=NO, 1=YES

Bit 2: Auto: 0=NO, 1=YES

Bit 3: Bypass: 0=NO, 1=YES

Bit 4: Request Output
0 = OFF, 1 = ON
Bit 5: Local Source ON: 0=NO, 1=YES
Bit 6: Remote Source ON: 0=NO, 1=YES
Bit 7: Local and Remote ON: 0=NO, 1=YES
Bit 7-15: Unused

6601

26114

Remote Off-state Change
Request