The serial connectors on the PCM are used to communicate with external devices, such as operator interface terminals, bar code readers, and programming devices. The Series 90-70 PCM has two serial connectors; each one supports both RS-232 and RS-485 operation. The serial ports are identical, and either port can be used for most applications. The two ports are configurable for different communication parameters. Note RS-485 is basically compatible with RS-422 devices. Series 90-30 PCMs have a single serial connector that supports two ports. One port has a fixed interface. Port 1 uses RS-232 operation only. The 160K PCM, IC693PCM300 is restricted to using RS-485 on port 2. All other Series 90-30 PCM modules may select either RS-232 or RS-485 operation on port 2. Caution The serial ports on almost all versions of the PCM are connected to electrical ground within the PLC.
Warning: include_once(/js/tracking.php): failed to open stream: No such file or directory in /var/www/series/revision.php on line 248
Warning: include_once(): Failed opening '/js/tracking.php' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/series/revision.php on line 248