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The communication (COM) port connector uses a 25-position, EIA-232-C
connector.
Connecting an External Modem
A standard crossover cable can be used to connect the COM port to an external
modem. Configure the external modem to be compatible with the FrameSaver unit.
Refer to
Connectors, Cables, and Pin Assignments
in the User’s Guide for standard
crossover cable external modem pin assignments and AT commands to configure the
modem and enable auto-answer.
Pin # Signal Direction
1 Shield (GND) —
2 DCE Transmit Data (TXD) From DTE (In)
3 DCE Receive Data (RXD) To DTE (Out)
4 DCE Request To Send (RTS) From DTE (In)
5 * DCE Clear To Send (CTS) To DTE (Out)
6 * DCE Data Set Ready (DSR) To DTE (Out)
7 Signal Ground (GND) —
8 * DCE Carrier Detect (CD) To DTE (Out)
9–19 Not used —
20 DCE Data Terminal Ready (DTR) From DTE (In)
21–25 Not used —
* Pins 5, 6, and 8 are tied together.