Cool Automation CoolMaster 3000T Manual do Utilizador descarregar pdf (Página 4)

RS232 Interface

CoolMaster PRM

www.coolautomation.com

Rev 3.8

2 RS232 Interface

2.1 Mechanical and Electrical Specification

RS232 Interface connector used in Cool Master is D-Type 9-pin DB9 female connector.

Cool Master DB9 Connector front view

DB9 Pin

Signal Lvel

Description

±12V

TxD (Data from Cool Master)

±12V

RxD (Data to Cool Master)

GND

Ground

Connecting Cool Master to Home Automation Equipment

In the picture above it is assumed that Terminal Equipment DB9 connector has RxD line on pin 2 and

TxD line on pin 3. (This is a standard for PC). If a Terminal Equipment (Home Automation Controller)

has a reversed pin out ( RxD on pin 3 and TxD on pin 2), the crossed RS232 cable must be used to

connect TxD to RxD and RxD to TxD.

According to RS232 specification cable length should not exceed 25m. RS232 Cable supplied with

Cool Master is 1.5m length suitable for direct connection to PC RS232 serial port.

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