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Hello,
i want to read my gasmeter L&G G350 with an optical probe(DIY).
But i like to know what is needed for reading out the optical port.
Do i need a modulating IR which modulates at 38khz or is it not needed to modulate the IR signal.
I would like to build my own probe, with the use of a arduino.
Then i need to send "/?!" to the IR transmitter, but how do i do that, do i need to convert to HEX and then send it, or do i need a sort of remote control protocol to send it.
Can someone help me with this, i would like to have more gasreading than once an hour.
landis Gyr G350
Hi,
We have clients who have made own optical strobe. There are also some scemas on the internet.
I can't remember address of that web site. You do not change /?! to hex. You just sent it as ASCII.
BR,
Mikko
so i have to create a ir led,
so i have to create a ir led, and phototransistor and then over serial send /?! at 300 baud 7E1.
That should be doable, will try this the next days, hope it works
landis Gyr G350
Hi,
Remember that you must use 38khz frequency. I know that there are people who have done this by them self. You can't use example PC's IRDA directly. This might help you.
https://learn.sparkfun.com/tutorials/ir-communication
BR,
Mikko
BR,
Mikko
That's what I meant with
That's what I meant with modulation.
So i does need toto modulate. And then send acai.
Will try to figure it out
landis Gyr G350
Hi,
Let me know how happened. For your information: bright sunlight might effect,
so it's good if transmitter is close to meter and not in direct sunlight.
BR,
Mikko
Maybe i build a modulator
Maybe i build a modulator circuit with an 555 timer, or use the timer of an arduino. Have to figure it out somehow. Will update here if it works
Getting no response with
Getting no response with arduino.
Have to figure it out.
Now I have a or led modulating at 38kHz and sending the right command at 300 baud 7e1 in ascii.(I think)
Tried almost every baud rate and parity. Also tried in hex. But no response whatsoever.
I seem not to get it working. Too bad. Have too find some working examples of arduino code
landis Gyr G350
Hi,
Remember to send /?!\r\n. 2F 3F 21 0D 0A in hex.
BR,
Mikko
small breakthrough.
small breakthrough.
I have found an optical probe for a fluke multimeter.
I tested it on my electric meter KAIFA MA304 and it responded. YES
I also tested on the G350 but it wasn't responding, maybe it needs different baudrate or parity, anyone who has working configuration specific for the G350???
am i using the right command
am i using the right command for this meter?
/?!\r\n
landis Gyr G350
Hi,
Technical documentation from Landis+Gyr G350 gas meter is limited and it's not saying is IEC 62056-21 supported. You can also try with modbus. It's supporting it, but I do not know is it used with optical connection.
BR,
Mikko
Will i get A readout when the
Will i get A readout when the signal is inverted. Maybe i can try a other usb/com cable which supports inverting.
How can I try modbus?
readout
Hi,
There are softwares for modbus. Problem is that you need to know register addresses. As far as I know ModBus is not support readout.
BR,
Mikko
Tommorrow i get an other usb
Tommorrow i get an other usb/com cable. Maybe when I invert the signal it works
anyone got this to work?
anyone got this to work?
when i just send /?! i get =========================
/?!
as output
when i send: /?!\r\n. 2F 3F 21 0D 0A
i get this as output: /?!
. 2F 3F 21 0D 0A
here is my python script im using:
import time
import serial
import re
ser = serial.Serial(
port='/dev/ttyUSB0',
baudrate=300,
parity=serial.PARITY_EVEN,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.SEVENBITS,
)
while 1:
ser.flushInput()
ser.write('/?!\r\n. 2F 3F 21 0D 0A')
time.sleep(15)
output=ser.read(ser.inWaiting())
print output
print '========================='
ser.flushInput()
anyone got this to work?
Hi,
Please, if you have a new question make a new topic for it.
You are asking device info using IEC 62056-21 protocol. Your serial port converter is echoing sent data back.
BR,
Mikko