RS-232C Cable Connection, Prescribe Frpo D0 command

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	Error	Error
	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	cable.Remove the plastic cover from the printer end of the
		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
	3	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
	4	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
	6	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
	7	thermofit tube.
	8	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
	1	metal object such as a doorknob.
	2	metal object such as a doorknob.
		Remove the plastie cap from the printer’s RS-232C
		interface connector.
	3	interface connector.
		Plug the printer end of the RS-232C interface cable
		into the printer’s RS-232C connector and screw it in
		into the printer’s RS-232C connector and screw it in
		place.
	4	Plug the other end of the cable into the computer’s
	4	RS-232C interface connector.
	5	RS-232C interface connector.
	5	Switch on the printer’s power.

B-4

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