Protech Systems PA-3222 User Manual page 46

Chapter 3 Hardware Configuration
Cash Drawer Configuration
The I/O port address of the cash drawer is 2E (hex) and 2F (hex). 2E (hex) is
the address port. 2F (hex) is the data port. User must first assign the address
of register by writing address value into address port 2E (hex), then write/read
data to/from the assigned register through data port 2F (hex).
Configuration Sequence
To program F81866 configuration registers, the following configuration
sequence must be followed:
(1) Enter the extended function mode
(2) Configure the configuration registers
(3) Exit the extended function mode
(1) Enter the extended function mode
To place the chip into the Extended Function Mode, two successive writes of
0x87 must be applied to Extended Function Enable Registers (EFERs, i.e. 2Eh
or 4Eh).
(2) Configure the configuration registers
The chip selects the Logical Device and activates the desired Logical Devices
through Extended Function Index Register (EFIR) and Extended Function
Data Register (EFDR). The EFIR is located at the same address as the EFER,
and the EFDR is located at address (EFIR+1). First, write the Logical Device
Number (i.e. 0x06) to the EFIR and then write the number of the desired
Logical Device to the EFDR. If accessing the Chip (Global) Control Registers,
this step is not required. Secondly, write the address of the desired
configuration register within the Logical Device to the EFIR and then write (or
read) the desired configuration register through the EFDR.
(3) Exit the extended function mode
To exit the Extended Function Mode, writing 0xAA to the EFER is required.
Once the chip exits the Extended Function Mode, it is in the normal running
mode and is ready to enter the configuration mode.
PA-3222 SERIES USER MANUAL Page: 3-16