SG - Signal Ground - (Pin 7) All signals can transmit between the printer and the host computer to send each signals with a signal ground.
RDB - Receive Data - (Pin 18) RDA - Receive Data Inverted - (Pin 3) These pins carry asynchronous data sent from the computer to the printer. (differential
input) SDB - Send Data - (Pin 10) SDA - Send Data Inverted - (Pin 9) These pins carry asynchronous data sent from the printer to the computer. (differential
output) RS-422A interface voltage levels The interface signal voltage levels conform with the EIA RS-422A standard. The differential voltage varies from 200
mV to 6V. SERIAL Connector The connector marked "IOIOI" (RS-232C/RS-422A) on the rear panel is a DB-25S connector. Use a DB-25P connector (or
equivalent) for the connector on the cable. C-7 C.3. RS-232C/RS-422A Protocol C.3.
RS-232C/RS-422A Protocol A protocol is a set of rules the computer follows in sending data to the printer. The RS-232C/RS-422A parameters are stored in
battery backed-up memory. They are indicated on the status printout. They can be changed by the FRPO (firmware reprogram) command described in the
Programming Manual. The parameters and their identification codes are given below. H1: Baud rate Parameter value 12 24 48 96 19 38 57 11 Baud rate
1200 2400 4800 9600 19200 38400 57600 115200 The factory setting is 9600 baud. H2: Data bits 7 or 8, factory-set to 8. H3: Stop bits 1 or 2, factory-set to
1. H4: Parity Parameter value 0 1 2 3 Meaning None Odd Even Ignore The factory setting is "None" (0 on the status printout). H5: Protocol logic Parameter
value 0 1 2 3 4 5 Meaning Combination of 1 and 3 below DTR/DSR, positive logic DTR/DSR, negative logic XON/XOFF ETX/ACK XON/XOFF recognized
only as protocol The factory setting is 0.
H6: Buffer nearly-full threshold This is a percentage from 0 to 99. The factory setting is 90. C-8 C.4. RS-232C Cable Connection H7: Buffer nearly-empty
threshold This is a percentage from 0 to 99.
The factory setting is 70. The factory settings of the buffer nearly-full and nearly-empty thresholds (H6 and H7) are subject to change without 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 10K bytes. The factory-set value is 6 meaning 60K bytes.
Since DTR/DSR protocol is not used with the RS-422A standard, select a parameter value other than 0, 1, or 2 for the H5 setting when using the RS-422A
interface. PRESCRIBE 2e FRPO D0 command The PRESCRIBE 2e FRPO D0 command is provided to allow manipulating XON/XOFF when an error has
occured on the serial interface. The following table summarizes the error status corresponding to different D0 values. Serial interface error error not handled
Timing of XON transfer to host while Ready or Waiting XON sent every 3-5 seconds D0 = 0 (default) XON not sent D0 = 10 error handled D0 = 1 D0 = 11
C.4. RS-232C Cable Connection Preparing an RS-232C Cable After obtaining an RS-232C cable, check that it is wired correctly, referring to the pin
assignment table in Appendix C. If you have an IBM communication adapter cable type 1502067, you will have to resolder the wiring at the printer end of the
cable. The procedure is as follows. 1. Unscrew the plastic cover from the printer end of the cable.
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 thermofit tube.
5. Cut wires 4, 5, 6, and 20. 6. Solder wires 5 and 6 together and connect them to pin 20.
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