reader.conf (5) - Linux Manuals
reader.conf: configuration file for pcscd readers' drivers
NAMEreader.conf - configuration file for pcscd readers' drivers
DESCRIPTIONThe /etc/reader.conf.d/reader.conf file contains configuration information for serial and (some) PCMCIA smart card readers.
SYNTAXThe /etc/reader.conf.d/reader.conf is a regular text file. Each reader must be defined by four fields:
The "FRIENDLYNAME" field is an arbitrary text used to identify the reader. This text is displayed by commands like pcsc_scan(1) that prints the names of all the connected and detected readers.
The "DEVICENAME" field was not used for old drivers (using the IFD handler version 2.0 or earlier). It is now (IFD handler version 3.0) used to identify the physical port on which the reader is connected. This is the device name of this port. It is dependent of the OS kernel. The first serial port device is called /dev/ttyS0 under Linux and /dev/cuaa0 under FreeBSD.
The "LIBPATH" field is the filename of the driver code. The driver is a dynamically loaded piece of code (generally a drivername.so*file).
The "CHANNELID" is no more used for recent drivers (IFD handler 3.0) and has been superseded by "DEVICENAME". If you have an old driver this field is used to indicate the port to use. You should read your driver documentation to know what information is needed here. It should be the serial port number for a serial reader.