Attention:
Serial line access via extcomm is deprecated and is no longer available in our OS running Debian 13.
Alternatively, all serial ports with N (eg. /dev/ttyNS0) 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 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 |
The LTE modem is build in the Patron S167, M267 and M567 units.
The unipi-lte package, which makes the use of an LTE modem available, also includes a virtual serial line for communication with the modem via AT commands (FID 1.x, FID 2.0+). Modem settings could be managed for example, by the minicom program, directly from the unit's Linux console (by SSH access).
In the control SW (Node-RED, etc.) the serial line can be used, for example, to send and receive SMS messages or calls.
| Modem's serial line for AT commands | /dev/ttyLTE_AT1
(or /run/unipi-plc/by-sys/lte.1/tty_at1) |
Since this is a virtual serial line, communication parameters (baudrate, parity, etc.) can be selected arbitrarily.
