Appendix B Host Computer Interface

3. Serial Interface (Option)

3.1 RS-232C Interface

The pins of the printer’s RS-232C interface connector carry the signals listed in the table below. The table also indicates whether each signal is incoming or outgoing with respect to the printer.

Pin

In/out

Signal

Description

 

 

 

 

1

-

FG

Frame ground

 

 

 

 

2

Out

TXD

Transmit Data

 

 

 

 

3

In

RXD

Receive Data

 

 

 

 

4

Out

RTS

Request To Send

 

 

 

 

5

In

CTS

Clear To Send

 

 

 

 

6

In

DSR

Data Set Ready

 

 

 

 

7

-

SG

Signal Ground

 

 

 

 

20

Out

DTR

Data Terminal Ready

Table B-3

Brief descriptions of the signals follow.

FG - Frame Ground - (Pin 1)

This pin is connected directly to the printer frame.

TXD - Transmit Data - (Pin 2)

This output carries asynchronous data sent by the printer to the computer. It is used mainly in handshaking protocols.

RXD - Receive Data - (Pin 3)

This input carries serial asynchronous data sent by the com- puter to the printer.

RTS - Request To Send - (Pin 4)

This output is always held high (above 3 volts).

CTS - Clear To Send - (Pin 5)

DSR - Data Set Ready - (Pin 6)

Unused.

SG - Signal Ground - (Pin 7)

All signals can transmit between the printer and the host computer to send each signal with a signal ground.

DTR - Data Terminal Ready - (Pin 20)

This output is used as a buffer nearly-full handshake line. It is held high (above 3 volts) when the buffer can accept more data.

RS-232C Interface Voltage Levels

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

4. RS-232C Protocol

A protocol is a set of rules the computer follows in sending data to the printer. They are indicated on the status page. Pa- rameters can be changed from the operator panel. See Changing Serial Interface Modes on page 3-19. The parame- ters and their identification codes are given below.

H1: Baud rate

Parameter value

Baud rate

 

 

12

1200

 

 

24

2400

 

 

48

4800

 

 

96

9600

 

 

19

19200

 

 

38

38400

 

 

57

57600

 

 

11

115200

Table B-4

The factory default setting is 9600 baud.

H2: Data bits

7 or 8; the factory default setting is 8.

H3: Stop bits

1 or 2; the factory default setting is 1.

H4: Parity

Parameter value

Meaning

 

 

0

None

 

 

1

Odd

 

 

2

Even

 

 

3

Ignore

Table B-5

The factory default setting is None (0 on the status printout).

B-3

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Image 105
HP WP36/50 manual Serial Interface Option, RS-232C Protocol, RS-232C Interface

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