Watlow 8LS Controller - Manual (Page 41)

Installation
8LS User’s Guide 33
Communications Set-up and Connections
The 8LS offers two types of serial communications: RS- 232 and RS-
485. Up to 32 addresses can be set in the 8LS for one communication
line. RS-232 can not be used for more than 1 controller.
Unless otherwise specified in the purchase order, units are shipped
configured for RS-232. They may be easily modified to RS- 485 by
moving a cable and a jumper plug. These may both be reached from the
bottom of the electronics assembly after it has been removed from the
chassis. The cable has a 4 pin connector which plugs into 4 pins on an 8
pin header on the processor card. RS-232 is on the 4 pins closest to the
front panel, while RS-485 is on the 4 pins nearest to the rear panel. The
connector is always installed with the red lead nearest the front panel.
The jumper plug is located near the cable connector. The position
closest to the rear panel is for RS-232, while the position nearest the
front panel is for RS-485.
RS-232 Connections
The optically-isolated RS-232 interface is connected using the
Communications terminal block 1. See table below for connections.
The computer pins are for the normal 25 pin RS-232 connector [DB25]
and the normal 9 pin connector [DB9]. On some computers transmit TX
and receive RX may be reversed. Please check your computer manual
for details.
Computer Connector 8LS Watlow Anafaze
DB 25 DB 9 TB 4 Pin No. Cable
RX Pin 3 RX Pin 2 TX Pin 2 White
TX Pin 2 TX Pin 3 RX Pin 4 Red
GND Pin 7 GND Pin 5 GND Pin 5 Black
485 232
232 485