Connection timed out

[peterspijker]

I am trying to communicate with my SDM120-modbus. I am pretty sure I have wired everything correctly (B to 9 and A to 10), but somehow I cannot talk to the SDM120. This is the output I am getting:

ubuntu@ubuntu:~/smartmeter$ SDM120C/sdm120c -a 1 -b 9600 -e -p -q -z 3 -j 20 -d 1 /dev/ttyUSB2 
20210123-20:23:38.858984: SDM120C/sdm120c(32257) debug_flag = 1
20210123-20:23:38.859152: SDM120C/sdm120c(32257) cmdline="SDM120C/sdm120c -a 1 -b 9600 -e -p -q -z 3 -j 20 -d 1 /dev/ttyUSB2"
20210123-20:23:38.859270: SDM120C/sdm120c(32257) szttyDevice: /dev/ttyUSB2
20210123-20:23:38.859373: SDM120C/sdm120c(32257) devLCKfile: </var/lock/LCK..ttyUSB2>
20210123-20:23:38.859472: SDM120C/sdm120c(32257) devLCKfileNew: </var/lock/LCK..ttyUSB2.32257>
20210123-20:23:38.859572: SDM120C/sdm120c(32257) PID: 32257
20210123-20:23:38.859781: SDM120C/sdm120c(32257) Attempting to get lock on Serial Port /dev/ttyUSB2...
20210123-20:23:38.859944: SDM120C/sdm120c(32257) Acquiring shared lock on /var/lock/LCK..ttyUSB2...
20210123-20:23:38.860058: SDM120C/sdm120c(32257) Shared lock on /var/lock/LCK..ttyUSB2 acquired...
20210123-20:23:38.860308: SDM120C/sdm120c(32257) Checking for lock
20210123-20:23:38.860536: SDM120C/sdm120c(32257) errno=0, bRead=2 PID=32257 LckPID=32257
20210123-20:23:38.860704: SDM120C/sdm120c(32257) Checking process 32257 (SDM120C/sdm120c) for lock
20210123-20:23:38.860906: SDM120C/sdm120c(32257) PID: 32257 COMMAND: "SDM120C/sdm120c" LckPID: 32257 LckCOMMAND: "SDM120C/sdm120c" LckPIDcommand "SDM120C/sdm120c" = me
20210123-20:23:38.861006: SDM120C/sdm120c(32257) Appears we got the lock.
20210123-20:23:38.861103: SDM120C/sdm120c(32257) resp_timeout=2000000us
20210123-20:23:38.861209: SDM120C/sdm120c(32257) Libmodbus context open (9600E1)
20210123-20:23:38.861311: SDM120C/sdm120c(32257) Byte timeout disabled.
20210123-20:23:38.861413: SDM120C/sdm120c(32257) New response timeout: 0s, 2000000us
20210123-20:23:38.865284: SDM120C/sdm120c(32257) 1/3. Register Address 30013 [000C]
20210123-20:23:39.366133: SDM120C/sdm120c(32257) ERROR (110) Connection timed out, 1/3, Address 30013 [000C]
20210123-20:23:39.366340: SDM120C/sdm120c(32257) Response timeout gave up after 500634us
20210123-20:23:39.366485: SDM120C/sdm120c(32257) 2/3. Register Address 30013 [000C]
20210123-20:23:39.867357: SDM120C/sdm120c(32257) ERROR (110) Connection timed out, 2/3, Address 30013 [000C]
20210123-20:23:39.867538: SDM120C/sdm120c(32257) Response timeout gave up after 500668us
20210123-20:23:39.867682: SDM120C/sdm120c(32257) 3/3. Register Address 30013 [000C]
20210123-20:23:40.368541: SDM120C/sdm120c(32257) ERROR (110) Connection timed out, 3/3, Address 30013 [000C]
20210123-20:23:40.368763: SDM120C/sdm120c(32257) Response timeout gave up after 500658us
20210123-20:23:40.370568: SDM120C/sdm120c(32257) devLCKfile: </var/lock/LCK..ttyUSB2>
20210123-20:23:40.370722: SDM120C/sdm120c(32257) devLCKfileNew: </var/lock/LCK..ttyUSB2.32257> 
20210123-20:23:40.370848: SDM120C/sdm120c(32257) Clearing Serial Port Lock (32257)...
20210123-20:23:40.371056: SDM120C/sdm120c(32257) Acquiring exclusive lock on /var/lock/LCK..ttyUSB2...
20210123-20:23:40.371282: SDM120C/sdm120c(32257) Exclusive lock on /var/lock/LCK..ttyUSB2 acquired (0) Success...
20210123-20:23:40.371573: SDM120C/sdm120c(32257) cmdLen=15
20210123-20:23:40.371711: SDM120C/sdm120c(32257) cmdLen=15 COMMAND is not null
20210123-20:23:40.371940: SDM120C/sdm120c(32257) errno=0, bRead=2 LckPID=32257 PID=32257 COMMAND='SDM120C/sdm120c'
20210123-20:23:40.372080: SDM120C/sdm120c(32257) errno=0, bRead=-1 LckPID=32257 PID=0 COMMAND=''
20210123-20:23:40.372391: SDM120C/sdm120c(32257) Clearing Serial Port Lock done
NOK
20210123-20:23:40.372705: SDM120C/sdm120c(32257) NOK

The USB-modbus-RS485 device is located on /dev/ttyUSB2 (I checked this with dmesg). Any help would be appreciated!

[peterspijker]

I have been fiddling a bit more, and after swapping some USB-connections on the Raspberry Pi I seem to be able to retrieve some data from the SDM120:

ubuntu@ubuntu:~/smartmeter$ SDM120C/sdm120c /dev/ttyUSB0 -P N
Voltage: 235.30 V 
Current: 0.31 A 
Power: 0.00 W 
Active Apparent Power: 70.59 VA 
Reactive Apparent Power: -70.51 VAR 
Power Factor: -0.05 
Phase Angle: 0.00 Degree 
Frequency: 50.00 Hz 
Import Active Energy: 6576848 Wh 
Export Active Energy: 0 Wh 
Total Active Energy: 6576848 Wh 
Import Reactive Energy: 1974940 VARh 
Export Reactive Energy: 1492504 VARh 
Total Reactive Energy: 3467444 VARh 
OK

But when I change the baud rate (from the default 2400) it errors in NOK. Any idea why this happens?

[gianfrdp]

Hello, have you changed default speed from 2400 to 9600 using parametr -r, after putting meter in programming mode (push front button for 3 sec).
If not, this is the cause