Appendix B Host Computer Interface

H5: Protocol logic

Parameter value

Meaning

 

 

0

Combination of 1 and 3 below

 

 

1

DTR/DSR, positive logic

 

 

2

DTR, negative logic

 

 

3

XON/XOFF

 

 

4

ETX/ACK

 

 

5

XON/XOFF recognized only as protocol

Table B-6

The factory default setting is 0.

H6: Buffer nearly-full threshold

This is a percentage from 0 to 99. The factory default setting is 90.

H7: Buffer nearly-empty threshold

This is a percentage from 0 to 99. The factory setting is 70. The factory default settings of the buffer nearly-full and near- ly-empty thresholds (H6 and H7) are subject to change with- out notification.

The gap between the nearly-full and nearly-empty thresholds allows the computer to send a fairly large amount of data in a continuous stream.

H8: Received-data buffer size

This is the size of the input buffer, specified in units of 10 Kbytes. The factory-set value is 6, meaning 60 Kbytes.

4.1 PRESCRIBE FRPO D0 command

The PRESCRIBE FRPO D0 command provides control over XON/XOFF operation when an error occurs on the serial in- terface. The following table summarizes the error status cor- responding to different D0 values.

Timing of XON transfer to host

Serial interface error

 

 

Error

Error

while Ready or Waiting

 

not resolved

resolved

 

 

 

XON sent every 3 to 5 seconds

D0=0

D0=1

 

(default)

 

 

 

 

XON not sent

D0=10

D0=11

 

 

 

Table B-7

 

 

5. RS-232C Cable Connection

5.1 Obtain a Suitable RS-232C Cable

Make sure that the RS-232C cable is wired correctly. The ca- ble must be a null modem cable; that is, one in which pin 2 on either end of the cable is connected to pin 3 on the other end. You cannot use a straight cable such as IBM communication adapter cable type 1502067 unless you purchase a null mo- dem adapter.

1

cable.Remove the plastic cover from the printer end of the

2

Next to each of the wires inside the cable is a bare

shield wire. Solder all these shield wires together

 

into a single bundle.

3

Using a section of flat wire about 3 mm wide and 15

mm long, connect the bundle of shield wires to the

 

metal facing of the connector. Check that the solder

 

connections are secure.

4

Desolder wires 2 and 3, then resolder them in

crossed configuration. Solder wire 2 to pin 3 and

 

wire 3 to pin 2. Cover the solder joints with ther-

mofit tube.

5

Cut wires 4, 5, 6, and 20.

6

Solder wires 5 and 6 together and connect them to

pin 20. Cover the solder joints with a thermofit tube.

 

Leave wire 4 unconnected.

7

Tape all remaining loose ends, or seal them with a

thermofit tube.

8

Attach the plastic cover back on.

5.2 Connecting the Printer to the Computer

Check that the power of both the printer and the computer is switched off.

1

Discharge yourself of static electricity by touching a

metal object such as a doorknob.

2

Remove the plastie cap from the printer’s RS-232C

interface connector.

3

Plug the printer end of the RS-232C interface cable

into the printer’s RS-232C connector and screw it in

 

 

place.

4

Plug the other end of the cable into the computer’s

RS-232C interface connector.

5

Switch on the printer’s power.

B-4

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HP WP36/50 manual RS-232C Cable Connection, Prescribe Frpo D0 command, Obtain a Suitable RS-232C Cable

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