User manual

Appendix D

INTERFACE CONNECTIONS

D-2

V.24/28 Interface Wiring

The DPX-213 uses the industry standard V.24 (RS-232) 25 Pin interface configured for a

modem (DCE - female). It is unlikely that the DPX-213 and your computer will need all

the pins shown, some are used only in synchronous operation, while other pins are needed

only by certain software packages.

The DPX-213 modem will operate with only three (3) active leads in the cable, transmit

data, receive data and ground on Pins 2, 3, and 7.

Table D.1 V.24 Interface Connectors

Pin Function CCITT

Number

Direction

(Modem In / Out)

SEE NOTE

(Below)

1 Protective Ground 101 Not Used

2 Transmit Data 103 In 1

3 Receive Data 104 Out 1

4 Request to Send 105 In 2

5 Clear to Send 106 Out 2

6 Data Set Ready 107 Out 3

7 Signal Ground 102 Common to Both 1

8 Carrier Detect 109 Out 3

9 Supply In 5

11 Reserved 6

12 Reserved 6

15 Transmit Clock 114 Out 4

17 Receive Clock 115 Out 4

20 Data Terminal Ready 108 In 3

NOTES: 1. Minimum signals for set-up & operation of the DPX-213.

2. Required for RTS/CTS flow control.

3. Optional for the DPX-213, may be needed by your communications package

in asynchronous mode, also needed to access some DPX-213 features such as

DTR dialling and so on.

4. Only required for synchronous operation, best left out of the cable for

asynchronous operation.

5. DC +12VC.

6. These wires are used to extend an internal serial bus out the DB25 connector

and should remain disconnected.