NCR 7454, User Manual

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1-16 Chapter 1: Product Overview
An integrated retail specific feature of the processor is the cash drawer
circuitry. The onboard circuitry internal to the board provides the
control for two external cash drawers. A portion of the POS Board
header (J6) is provided on the board to interface to the dual cash
drawer connector. Header J6 only contains the control signals; it does
not provide power. Software controls the cash drawer(s) through I/O
port 00Exh. This means it can be I/O ports E0/E1h, E2/E3h, E4/E5h,
or EA/EBh depending on the configuration of the SMC I/O
controller’s GPIO port(s). Default setting is E0/E1h.
Cash Drawer I/O Port Bit Definition:
Bit # Description Bit = 1 Bit = 0
7 Solenoid B Control Turns off solenoid
output Activates solenoid
output
6 Solenoid A Control Turns off solenoid
output Activates solenoid
output
5 Reserved Reserved Reserved
4 Reserved Reserved Reserved
3 Solenoid B Status Solenoid B output
active Solenoid B output
inactive
2 Solenoid A Status Solenoid A output
active Solenoid A output
inactive
1 Reserved Reserved Reserved
0 Cash Drawer(s) Status Drawer(s) open Drawer(s) closed
Note: Bits 2 and 3 are set to ‘1’ by each device reset.
The cash drawer interface can be diagnosed remotely. For security
reasons, the cash drawer diagnostics mode must first be activated by
pressing an external momentary switch (SW2). The intention is for
authorized personnel to be present when the cash drawer diagnostic
tests take place.
There is only one cash drawer status signal; therefore, bit 0 is the status
of either cash drawer or both cash drawers.