Так. Проверяем что пусто:
Data to write: 0x1
Opening /dev/ttyRS485-1 at 9600 bauds (N, 8, 2)
[37][05][14][51][FF][00][DD][8D]
Waiting for a confirmation...
<37><05><14><51><FF><00><DD><8D>
SUCCESS: written 1 elements!
root@wirenboard-ACAX3M6K:~# for i in {2000..2050}; do echo "register $i data $(modbus_client --debug -mrtu -pnone -s2 /dev/ttyRS485-1 -a55 -t0x03 -r$i | grep Data:)"; done
register 2000 data Data: 0x0000
register 2001 data Data: 0x0000
register 2002 data Data: 0x0000
register 2003 data Data: 0x0000
register 2004 data Data: 0x0000
register 2005 data Data: 0x0000
register 2006 data Data: 0x0000
register 2007 data Data: 0x0000
register 2008 data Data: 0x0000
register 2009 data Data: 0x0000
register 2010 data Data: 0x0000
register 2011 data Data: 0x0000
register 2012 data Data: 0x0000
register 2013 data Data: 0x0000
register 2014 data Data: 0x0000
register 2015 data Data: 0x0000
register 2016 data Data: 0x0000
register 2017 data Data: 0x0000
register 2018 data Data: 0x0000
register 2019 data Data: 0x0000
register 2020 data Data: 0x0000
register 2021 data Data: 0x0000
register 2022 data Data: 0x0000
register 2023 data Data: 0x0000
register 2024 data Data: 0x0000
register 2025 data Data: 0x0000
register 2026 data Data: 0x0000
register 2027 data Data: 0x0000
register 2028 data Data: 0x0000
register 2029 data Data: 0x0000
register 2030 data Data: 0x0000
register 2031 data Data: 0x0000
register 2032 data Data: 0x0000
register 2033 data Data: 0x0000
register 2034 data Data: 0x0000
register 2035 data Data: 0x0000
register 2036 data Data: 0x0000
register 2037 data Data: 0x0000
register 2038 data Data: 0x0000
register 2039 data Data: 0x0000
register 2040 data Data: 0x0000
register 2041 data Data: 0x0000
register 2042 data Data: 0x0000
register 2043 data Data: 0x0000
register 2044 data Data: 0x0000
register 2045 data Data: 0x0000
register 2046 data Data: 0x0000
register 2047 data Data: 0x0000
register 2048 data Data: 0x0000
register 2049 data Data: 0x0000
register 2050 data Data: 0x0000
Для начала попробуем в RAM записать. Стартуем запись:
modbus_client --debug -mrtu -b9600 -s2 -pnone /dev/ttyRS485-1 -a55 -t5 -r5001 1
Data to write: 0x0
Opening /dev/ttyRS485-1 at 9600 bauds (N, 8, 2)
[37][05][13][89][00][00][1D][32]
Waiting for a confirmation...
<37><05><13><89><00><00><1D><32>
SUCCESS: written 1 elements!
Нажимаем кнопку пульта, отключаем:
modbus_client --debug -mrtu -b9600 -s2 -pnone /dev/ttyRS485-1 -a55 -t5 -r5001 0
Data to write: 0x0
Opening /dev/ttyRS485-1 at 9600 bauds (N, 8, 2)
[37][05][13][89][00][00][1D][32]
Waiting for a confirmation...
<37><05><13><89><00><00><1D><32>
SUCCESS: written 1 elements!
Проверяем:
root@wirenboard-ACAX3M6K:~# for i in {2000..2050}; do echo "register $i data $(modbus_client --debug -mrtu -pnone -s2 /dev/ttyRS485-1 -a55 -t0x03 -r$i | grep Data:)"; done
register 2000 data Data: 0x01c6
register 2001 data Data: 0x01bb
register 2002 data Data: 0x003f
register 2003 data Data: 0x009b
register 2004 data Data: 0x003d
register 2005 data Data: 0x0031
register 2006 data Data: 0x003b
register 2007 data Data: 0x009f
register 2008 data Data: 0x003c
register 2009 data Data: 0x009f
register 2010 data Data: 0x003c
register 2011 data Data: 0x0031
register 2012 data Data: 0x003c
register 2013 data Data: 0x0031
register 2014 data Data: 0x003b
register 2015 data Data: 0x009f
register 2016 data Data: 0x003c
register 2017 data Data: 0x0032
register 2018 data Data: 0x003c
register 2019 data Data: 0x0031
register 2020 data Data: 0x003c
register 2021 data Data: 0x009e
register 2022 data Data: 0x003c
register 2023 data Data: 0x0032
register 2024 data Data: 0x003c
register 2025 data Data: 0x0031
register 2026 data Data: 0x003c
register 2027 data Data: 0x009e
register 2028 data Data: 0x003d
register 2029 data Data: 0x009e
register 2030 data Data: 0x003c
register 2031 data Data: 0x0031
register 2032 data Data: 0x003c
register 2033 data Data: 0x009f
register 2034 data Data: 0x003c
register 2035 data Data: 0x0031
register 2036 data Data: 0x003c
register 2037 data Data: 0x009f
register 2038 data Data: 0x003b
register 2039 data Data: 0x009f
register 2040 data Data: 0x003c
register 2041 data Data: 0x009f
register 2042 data Data: 0x003c
register 2043 data Data: 0x009e
register 2044 data Data: 0x003c
register 2045 data Data: 0x0031
register 2046 data Data: 0x003c
register 2047 data Data: 0x009f
register 2048 data Data: 0x003c
register 2049 data Data: 0x009e
register 2050 data Data: 0x003c
Воспроизводим:
odbus_client --debug -mrtu -b9600 -s2 -pnone /dev/ttyRS485-1 -a55 -t5 -r5002 1
Data to write: 0x1
Opening /dev/ttyRS485-1 at 9600 bauds (N, 8, 2)
[37][05][13][8A][FF][00][AC][C2]
Waiting for a confirmation...
<37><05><13><8A><FF><00><AC><C2>
SUCCESS: written 1 elements!
При этом передатчик мограет, в камеру видно.
У вас прошивка какая?