Page 862 of 894 QPC841 Quad Serial Data Interface card

Connector pin assignments

Connector J1 is connected to port one, and uses the RS-232-C standard DB-25 pinout. Connector J2 is connected to ports two, three, and four, and is a non-standard pinout that requires an adapter cable. An adapter cable (NT8D96) splits the J2 signals out to three standard RS-232-C connectors. Port 2 is connected to connector A, Port 3 is connected to connector B, and Port 4 is connected to connector C.

Table 268 shows the pinouts for connector J1, and Table 269 on page 863 shows the pinouts for connector J2.

Table 268

Connector J1 pin assignments

Pin

 

 

 

number

Signal

Purpose in DTE mode

Purpose in DCE mode

 

 

 

 

1

FGD

Frame ground

Frame ground

2

TD

Received data

Transmitted data

3

RD

Transmitted data

Received data

4

RTS

Request to send (not used)

Request to send (Note 2)

5

CTS

Clear to send (Note 1)

Clear to send

6

DSR

Data set ready (Note 1)

Data set ready

7

GND

Ground

Ground

8

CD

Carrier detect (Note 1)

Carrier detect (not used)

20

DTR

Data terminal ready

Data terminal ready (Note 2)

 

 

 

 

Note 1: In DTE mode, the signals CD, DSR, and CTS are tied to +12 volts (through a resistor) to indicate that the QSDI port is always ready to transmit and receive data.

Note 2: In DCE mode, the signals DTR, and RTS are tied to +12 volts (through a resistor) to indicate that the QSDI port is always ready to transmit and receive data.

553-3001-211 Standard 2.00 September 2004

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