Hello,
I recently purchased an "Metrahit Ultra BT" DMM, which is able to communicate
via Bluetooth. By use of "rfcom" and "btmon", I was able to do some rudimentary
communication.
First of all, one has to connect to the device as with every other BT device by
using "bluetoothctl" (scan, trust, pair), than we can create a Link to the DMM
with
"sudo rfcomm bind rfcomm0 00:07:80:xx:yy:zz"
which genereates /dev/rfcomm0
I then tried "sigrok-cli --driver=gmc-mh-1x-2x-rs232:conn=/dev/rfcomm0" which
didn't work at all.
However, if I printf some commands into /dev/rfcomm0, I obtain valid answers:
printf "%s\n\r" "IDN?" >/dev/rfcomm0
(the "\n\r" seems to be very mandantory!)
answer in btmon:
Address: 0x09 cr 0 dlci 0x02
Control: 0xef poll/final 0
Length: 1
FCS: 0x40
47 40 G@
...
4d 43 2c 4d 45 54 52 41 48 49 54 20 55 4c 54 52 MC,METRAHIT ULTR
41 20 42 54 2c 49 44 45 4e 54 20 4e 4f 2e 3a 20 A BT,IDENT NO.:
4d 32 34 38 42 2c 53 45 52 49 41 4c 20 4e 4f 2e M248B,SERIAL NO.
...
or to get a value from the DMM:
command:
printf "%s\n\r" "SENS:VOLT:ACDC:AUTO" >/dev/rfcomm0
answer:
4f 40 O@
4b 0d 0a 40 K..@
command:
printf "%s\n\r" "VAL:L?" >/dev/rfcomm0
answer:
30 40 0@
2c 30 2c 56 41 43 44 43 2c 30 2e 33 45 2b 31 0d ,0,VACDC,0.3E+1.
0a 40 .@
The commands send to the device are adopted from the document "METRAHIT ENERGY
– Interface Protokoll (MaBe 2010-08-27)", which can be found on the net. I
requested the specific Protocol for the ULTRA from GMC, but no response.
Now to the question: Obviously there is no support yet for ULTRA BT in sigrok.
What would be the nearest starting point to get startet with some
implementation?
I guess Agilent-DMM driver? Any other ideas?
Best regards,
Mülly
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