This section talks about using LCDproc with a point of sale ("POS") character-display.
The serialPOS driver is currently working with the AEDEX emulation protocol,
but can be extended to work with various other protocols.
The driver should operate most character POS displays with a serial (RS-232) input. Because these displays use a standardized protocol, if the protocol is supported by your display, it should work as expected. Feedback is welcome.
Table 5.17. serialPOS: Emulation Protocol Status
| Protocol | Display tested | Currently Supported | Remark |
|---|---|---|---|
| AEDEX | Emax | Yes | |
| IEE | No | ||
| Epson | No | ||
| Emax | No | ||
| IBM | No | ||
| Logic Controls | No | ||
| Ultimate | No |
(…): Feature not tested.
Connecting the display should consist of simply plugging it into your computer's RS-232 port. Because these displays typically support full RS-232, no additional wiring is needed. If your computer does not have such a port (many newer computers don't), you can use a USB to serial adapter with the appropriate driver.
If your display supports a pass-through function, but you do not have another RS-232 device connected to the pass-through port, you may experience hangs if an improperly formatted command sneaks through. This is because the display is waiting for the pass-through device to accept the data and a blocking state is created within the device. You can either connect another RS-232 device, or rewire the display to send the pass-through commands back to your computer.
DEVICE
Device to use in serial mode. Usual values are /dev/ttyS0 or
/dev/cu.usbserial. Default is /dev/lcd.
WIDTH
x
HEIGHT
Specifies the size of the VFD in characters.
If not given, it defaults to 16x2.
IEE | AEDEX | Epson | Emax | IBM | LogicControls | Ultimate }
Set the communication protocol to use with the POS display.
If not specified it defaults to AEDEX.
Currently, only AEDEX is supported.
1200 | 2400 | 9600 | 19200 | 115200 }
Set the the baud rate communication with the POS display.
If not given the default of 9600 is used.