TITLE
    LaserWriter IINTX: Switch Configurations
Article ID:
Author:
Created:
Modified: 		2031

1/15/88
7/10/98
TOPIC

    The LaserWriter IINTX has a bank of 6 DIP switches located on the controller panel. These switches are used for controlling the mode of operation, serial port configuration, and communication parameters. The switches will be preset to the AppleTalk configuration.

DISCUSSION

    Switch 1
    Switch 2
    Meaning
    Up
    Up
    		8 pin AppleTalk (Serial Port Disabled)
    Down
    Up
    		25 pin RS-232 and 8 pin RS-422 *
    Serial Ports 1200 baud
    Up
    Down
    		25 pin RS-232 and 8 pin RS-422 *
    Serial Ports 9600 baud
    Down
    Down
    		25 pin RS-232 serial port 9600 baud;**
    8 pin RS-422 serial port 0 baud
    Switch 3
    Switch 4
    Meaning
    Up
    Up
    		PostScript Batch
    Down
    Up
    		Diablo 630
    Down
    Down
    		HP LaserJet
    Up
    Down
    		PostScript Interactive
    Switch 5
    Switch 6
    Meaning
    Down
    Down
    		No Handshake
    Up
    Up
    		ON/XOFF
    Down
    Up
    		Etx/Ack
    Up
    Down
    		DSR

    * Both serial ports are enabled. Serial communication and AppleTalk communication are NOT compatible, and will never occur at the same time.

    ** This configuration allows you to use the 25 pin RS-232 port while leaving LocalTalk connected. This prevents serial communication from interfering with the AppleTalk Network.

    The switch configuration settings are maintained between power-off and power-on cycles by the 2K battery-backed-up ZPRAM (Zero-Power-RAM) equivalent to the EEROM of the LaserWriter IINT. The same PostScript commands that are used to modify the EEROM parameters will ALSO set or read the ZPRAM parameters. Consistency between the switch configurations and the ZPRAM is maintained through the VIA. Toggling a switch, waiting 30 seconds, then toggling the switch back forces the ZPRAM to update to the current switch settings.
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