01-09-2020
If you can unplug the ethernet-RS232 adapter from the display I think I'd be inclined to test the ethernet-RS232 adapter by shorting pins 2 & 3 (is this a DB9 or a DB25 connector) to loop back any received characters, make a connection over ethernet and see if the adapter echos the characters typed. Also, directly connect a laptop to the serial input of the display (using an old laptop with a DB9 serial connector or a USB-serial adapter) and see if you can control the display using the commands given.
Once both of those tests are done reconnect the ethernet-RS232 adapter to the display. Remember to also consider baud rates, 8 bit or 7 bit, stop bits, and parity/no parity which could also cause it not to work until they are aligned.
Last edited by hicksd8; 01-09-2020 at 12:46 PM..
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LEARN ABOUT DEBIAN
gammu-detect
GAMMU-DETECT(1) Gammu GAMMU-DETECT(1)
NAME
gammu-detect - Gammu device detection
New in version 1.28.95.
SYNOPSIS
gammu-detect [OPTIONS]
DESCRIPTION
Script to detect available devices, which might be suitable for gammu.
Note This program lists all devices, which might be suitable, it does not do any probing on devices them self.
Currently it supports following devices:
o USB devices using udev
o Serial ports using udev
o Serial ports on Windows
o Bluetooth devices using Bluez
Note Supported devices depend on platform you are using and compiled in features. You can find out what is actually compiled in by run-
ning gammu-detect -v.
This program follows the usual GNU command line syntax, with long options starting with two dashes (--). A summary of options is included
below.
-h, --help
Show summary of options.
-d, --debug
Show debugging output for detecting devices.
-v, --version
Show version information and compiled in features.
-u, --no-udev
Disables scanning of udev.
-b, --no-bluez
Disables scanning using Bluez.
-w, --no-win32-serial
Disables scanning of Windows serial ports.
OUTPUT
The output of gammu-detect is configuration file for Gammu (see gammurc) with configuration section for every device which might be used
with gammu.
Note You can choose which section to use in gammu by gammu -s.
When invoked as gammu-detect -d, also all examined devices are listed as comments in the output.
EXAMPLE
; Configuration file generated by gammu-detect.
; Please check The Gammu Manual for more information.
[gammu]
device = /dev/ttyACM0
name = Nokia E52
connection = at
[gammu1]
device = /dev/ttyACM1
name = Nokia E52
connection = at
[gammu2]
device = /dev/ttyS0
name = Phone on serial port 0
connection = at
[gammu3]
device = /dev/ttyS1
name = Phone on serial port 1
connection = at
[gammu4]
device = /dev/ttyS2
name = Phone on serial port 2
connection = at
[gammu5]
device = /dev/ttyS3
name = Phone on serial port 3
connection = at
[gammu6]
device = 5C:57:C8:BB:BB:BB
name = Nokia E52
connection = bluephonet
AUTHOR
Michal iha <michal@cihar.com>
COPYRIGHT
2009-2012, Michal iha <michal@cihar.com>
1.31.90 February 24, 2012 GAMMU-DETECT(1)