
Some appliances offer selectable RS232, RS422 or RS485. Some have DB9 connectors and others RJ45 serial ports connectors (and there can be three varieties of RJ pin-out available):

Similarly some families (CM/IM) have internal power supplies, others (ACM/SD) are external. And there are DC supply and dual power options.
Click here for details of the serial cable adapter to use with your Opengear device.
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