DEVICE DRIVERS
IBM ECR Tailgate & Feature C
100 M
X
800 SERIES PROGRAMMERS GUIDE
COM4 - Optional I/O
Module
COM4, or device /dev/ttySAC2, is available only to the I/O Module and is
dedicated for RFID capability. A physical serial port connector maybe available as
a future enhancement to this module so that it may be connected to a variety of
devices.
COM5
COM5, or device /dev/ttygser, is actually a serial device that transmits and
receives data over a USB cable using the USB “Gadget” technology. This allows
the M
x
800 series of terminals to act like any other serial port when connected to a
USB host port. The M
x
800 series of terminals can be configured to become a USB
device that can emulate being a serial port and be connected to a USB host. The
M
x
800 series terminal’s USB device cable can be connected to a Windows or
Linux based OS machine and look like another COM port to that machine. This
allows serial transfer of data back and forth between the M
x
800 series terminal
and a PC.
Serial Gadget uses the “bulk” transfer method as defined in USB 2.0 specification.
This transfer method is fixed to a 512 byte maximum packet size. The user/
application should be aware of this limitation when using this COM port to transfer
data making sure that any remote communication program does not set its packet
size greater than this maximum size.
IBM ECR
Tailgate &
Feature C
The succeeding section lists the IBM ECR APIs used both in Tailgate and Feature
C mode.
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