Owner manual

Installation
CLS User’s Guide 43
Serial Communications
The CLS is factory-configured for RS-232 communications. However,
the communications are jumper-selectable, so you can switch between
RS-232 and RS-485. (See Configuring Communications below.) You
can also order a communications cable from Watlow Anafaze or make
your own cable.
RS-232 Interface
With RS-232 communications, you can connect the CLS directly to the
serial communications connector on an IBM-PC or compatible
computer. (PC-compatible computers typically use RS-232
communications.) The RS-232 interface is a standard three-wire
interface. See the table below for connection information. (Some
computers reverse transmit (TX) and receive (RX), so check your
computer manual to verify your connections.)
You can use either RS-232 or RS-485 communications in these
situations:
•
When you are using local communications (up to 50 feet).
•
When you are using a single CLS.
If you are using RS-232 communications with grounded thermocouples,
use an optical isolator between the controller and the computer.
This table shows RS-232 connections for 25-pin and 9-pin connectors.
RS-485 Interface
•
If you use more than one CLS, you must use RS-485 communica-
tions.
•
If you have connected the CLS to a computer more than 50 feet
away, Watlow Anafaze recommends that you use RS-485 communi-
cations.
If you use RS-485 communications, attach an optically isolated RS-232
to RS-485 converter to the computer. You can use an internal converter
card or an external plug-in converter.
DB 25
Connector
DB 9
Connector
CLS Back TB
Watlow Anafaze
Cable
RX Pin 3 RX Pin 2 TX Pin 26 White
TX Pin 2 TX Pin 3 RX Pin 25 Red
GND Pin 7 GND Pin 5 GND Pin 23 Black