See the table below to find out how the physical RS485 serial port lines are mapped into Linux ports within /dev/.
RS485-1.1
RS485-2.1
RS485-3.1
GSM
S103
ttyNS0
x
x
x
S103-G
ttyNS0
x
x
ttyAMA0
M103
ttyNS0
x
x
x
M203
ttyNS0
x
x
x
M303
ttyNS0
x
x
x
M403
ttyNS0
x
x
x
M503
ttyNS0
ttyNS1
x
x
M523
ttyNS0
ttyNS1
x
x
L203
ttyNS0
x
x
x
L303
ttyNS0
x
x
x
L403
ttyNS0
x
x
x
L503
ttyNS0
ttyNS1
x
x
L523
ttyNS0
ttyNS1
x
x
L513
ttyNS0
ttyNS1
ttyNS2
x
L533
ttyNS0
ttyNS1
ttyNS2
x
Attention:
Serial line access via extcomm is deprecated and is no longer available in our OS running Debian 13..
Alternatively, all serial ports mentioned below are also accessible via /dev/extcomm/Y/X, where Y is the number of section, and X is the number of the serial port. X and Y are counted from 0.
USB ports
USB converters (FTDI, CH34x, PLxxxx and CPxxxx) are also supported by default. For using other gateways or devices, installation of drivers is necessary.
USB1
/dev/serial/by-port/0
USB2
/dev/serial/by-port/1
USB3
/dev/serial/by-port/2
USB4
/dev/serial/by-port/3
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