B.3 Serial Interface (Option)

B.3 Serial Interface (Option)

Installing the optional serial interface board kit (IB-11) in the printer enables connection to a computer with an RS-232C standard serial interface.

B.3.1 Interface Signals

Table B-4below shows the pins and corresponding input and output signals of the RS-232C interface connector.

Pin

In or out

Signal

Description

1

—

FG

Frame Ground. This pin is connected directly to the printer

 

 

 

frame.

 

 

 

 

2

Out

TXD

Transmit Data. This pin is used to output asynchronous data

 

 

 

sent from the printer to the computer. This signal is often used

 

 

 

in handshaking.

 

 

 

 

3

In

RXD

Receive Data. This pin is used to input serial asynchronous

 

 

 

data sent from the computer to the printer.

 

 

 

 

4

Out

RTS

Request To Send. This output is always high (above 3 volts).

 

 

 

 

5

In

CTS

Clear To Send. Not used.

 

 

 

 

6

In

DSR

Data Set Ready. Not used.

 

 

 

 

7

—

SG

Signal Ground. This pin is used to establish a common refer-

 

 

 

ence level for the voltages of all signals other than Frame

 

 

 

Ground.

 

 

 

 

20

Out

DTR

Data Terminal Ready . This pin is used to notify the status of

 

 

 

the printer buffer (i.e., nearly full or nearly empty) when hand-

 

 

 

shaking is used. The pin goes high (above 3 volts) when the

 

 

 

buffer is able to accept more data.

 

 

 

 

Table B-4

B.3.2 Interface voltage levels

The voltage levels of the interface signals conform to EIA RS-232C specifications. The voltage level of SPACE is 3 to 15 volts. The voltage level of MARK is -3 to -15 volts. Voltages between -3 and 3 volts are undefined.

B-6

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Xerox FS-C8008N, FS-C8008DN manual Serial Interface Option, Interface voltage levels, Pin Or out Signal Description
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