Honeywell Touchpoint 4 User Manual

Touchpoint 4 Serial Communication Protocol Issue 1 09/07
1
Introduction
Overview
This manual describes the setup and operation of the Touchpoint 4 Serial
Communication protocol.
Your Touchpoint 4 gas detector controller is equipped with a serial remote device
communication port. With this communication port, you can monitor the Touchpoint 4
system’soperationwithmasterfromaremotelocation.Itwillalsoallowyoutogather
gas concentration data for analysis or reports.
The Touchpoint 4 gas detector controller accepts commands and issues responses to
any valid command it receives. The Touchpoint 4 gas detector controller is always the
“slave”device,andtheremoteequipmentisthe“master”device.Themastercanbea
personal computer (PC), a programmable logic controller (PLC), or other device capable
ofRS-485serialcommunications.Thiscongurationrequiresa“master”device.
Therefore, one Touchpoint 4 gas detector controller will not communicate directly with
another Touchpoint 4 gas detector controller. However, one master can be used to
communicate with more than one Touchpoint4 gas detector controllers on a two-wire
RS-485 bus.
The Touchpoint 4 gas detector controller supports multiple baud rates. These user
selectableratesare1200,2400,4800,9600,and19,200.Additionalportsettingsare
8-bit, 1 stop bit, and no parity.
TheslaveisidentiedbyanaddressconguredintotheTouchpoint4gasdetector
controller (selectable 1-16). Each Touchpoint4 gas detector controller on an RS-485
network must have a unique address.
Themasterisalwaysataddress0.EachTouchpoint4gasdetectorcontrollerwill
respond to a signal directed to it from the master. To prevent a collision of messages, the
master must avoid transmitting any information after a packet until the slave responds.
Touchpoint4willrespondin500ms.

Honeywell Touchpoint 4 Specifications

General

Brand	Honeywell
Model	Touchpoint 4
Category	Gas Detectors
Language	English