User manual

Section 2

INSTALLATION

2-3

2.3 Connecting a Terminal or Computer to the DPX-213

The DPX-213 uses the industry standard 25 Pin "D" connector as its data interface, with

the signals defined in the CCITT V.24, V.28 and EIA RS-232C for modems. The DPX-

213 operates as Data Circuit-terminating Equipment (DCE).

If you wish to connect the DPX-213 to a terminal or computer with a serial port configured

as Data Terminal Equipment (DTE), then a "straight through" cable connecting

corresponding pins of the serial ports should work. If the computer serial port is configured

as a DCE, then you must use a "cross over" or "null modem" cable. Most personal

computers and terminals have their serial interface configured for DTE operation. The

connections needed for dumb terminals, PC's and asynchronous operation are described in

Appendix D.

NOTE: When connecting the RS-232 cable to the PC, DO NOT connect the cable to the

DB25 female connector on the rear of the PC. This is the parallel port and

connection may cause damage to your PC. At the PC end, the cable should be

connected to a male connector (serial port) for correct operation.

The terminal cable to the modem should be less than 15 meters in length and restrained

with screw locks at both ends to avoid placing too much strain on the cable. Round cable is

recommended. Ribbon cables MUST be kept as short as possible to minimise clock and

data interference in the ribbon.

2.4 Front Panel Indicators

The front panel of the DPX-213 contains 4 LED's (Light Emitting Diodes), which are used

to indicate modem and line status.

Figure 2.3 Front Panel Layout