Printronix P9000 Series manual Alternate Terminating Resistors, RS-232 Serial Interface

Centronics Parallel Interface Configuration

The printer is configured according to the interface specified during printer configuration (reF fer to the Configuration chapter). If, however, the interface configuration parameters need to be changed, printer configuration is also user selectable. The following configuration parameF ters can be verified or changed as necessary to meet specific application requirements:

nInput Buffer Size (Selected from the Application Compatibility Menu)

nData Bit 8 (Enable or Disable)

nPI Line (Enable or Disable)

nData Polarity (standard or inverted)

nResponse Polarity (standard or inverted)

nLatch Data On Leading or Trailing Edge of Strobe

nFast Busy (Enable or Disable)

These parameters are displayed under the Application Compatibility/Host Interface/ Centronics submenu selectable from the control panel. Refer to the Control Panel ConfiguraF tion Diagram in the Configuration chapter for information on selecting the various parameter values.

Alternate Terminating Resistors

For parallel interface configurations, the printer is equipped with 470 ohm pullup and 1K pulldown terminating resistors located at board coordinates 5V and 4V respectively, on the DCU PCBA 132015. Generally, these terminating resistors are suitable for most applications. If, however, the standard terminating resistor pack is not compatible with the particular interF face driver requirements of the host, other values of pullup/pulldown resistors may be necesF sary. Printronix provides the 220 ohm pullup and 330 ohm pulldown alternate terminating resistors. If the 220 ohm pullup resistor is used, the 330 ohm pulldown resistor should be used with it.

To install the alternate terminating resistors, perform the following steps.

1.Turn the printer off and disconnect the AC power cord.

2.Remove the DCU PCBA as described in Appendix F, Hardware Jumper Configuration.

3.Remove the 470 ohm resistor pack from the socket at location 5V.

4.Plug the 220 ohm resistor pack into the socket at location 5V.

5.Remove the 1K ohm resistor pack from the socket at location 4V.

6.Plug the 330 ohm resistor pack into the socket at 4V.

7.Re-install the DCU PCBA as described in Appendix F, Hardware Jumper ConfiguraF tion.

8.Reconnect the AC power cord and turn the printer on.

RS-232 Serial Interface

This interface is used with bit serial devices compatible with EIA- RS-232C or CCITT V.24 standards. The serial data transfer baud rate is selectable from the control panel. Baud rates of

Interfaces 7-5