Printronix L1024, Maintenance Manual

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10–3 Chapter 10 – Control Panel
10.2.1 Mechanical
The control panel has a 16-character by 2-line Liquid Crystal Display (LCD). In addition, there are three
status lights and seven keys. The keys are membrane-type switches with the function printed on each
one. The status lights are used to monitor the printer state, data in the buffer, and the online status. The
LCD allows the user to display the programmable functions that control the printer. It also shows the
printer status and other control information.
10.2.2 Electrical
The control panel is connected to the engine controller via connector CN on the back of the display panel.
This is connected to a straight-through 26-pin connector and via a 26-wire cable to the engine controller
at J3. This connector is keyed to make sure it can be plugged in only one way.
The following table lists the interface cable pin connections and their functions:
Table 10–1. Control Panel Interface Signals
Pin Number Function
1 No connection
2 Ground
3 +5 volts
4 (RS) register select; 0 for instruction register, 1 for data regis-
ter
5 (R/W) read/write select; 0 for write, 1 for read
6 (E) strobe to signal start of data read or write
7 (DB0) Data bit 0
8 (DB1) Data bit 1
9 (DB2) Data bit 2
10 (DB3) Data bit 3
11 (DB4) Data bit 4
12 (DB5) Data bit 5
13 (DB6) Data bit 6
14 (DB7) Data bit 7
15 (SW Reset) Reset Key
16 (SW Online) Online Key
(Continued on next page)