Brann Fenix
08-31-2006, 11:13 PM
Hi,
I am working on a little side project for a friend of mine which requires a Telaire 8001 CO2 sensor. I have only really worked with a TTL LCD as far as interfacing via serial communication with the BS2, so this is new stuff for me. I just wanted to ask for some ideas and run some stuff by everyone before I ever power this sensor up and risk damage. Here is what I know:
a. The sensor using RS-232 and has an optional cable and PC software. This means I will need something on the lines of a MAX232 in order to connect to it.
b. The pin out for the sensor is as follows:
Pin 1 = Not Used
Pin 2 = Not Used
Pin 3 = Relay Normally Open
Pin 4 = Relay Common
Pin 5 = Relay Normally Closed
Pin 6 = 4-20mA Output
Pin 7 = Signal Ground
Pin 8 = 0-10v Output
c. The docs for the sensor are here http://www.gesensing.com/downloads/manuals/8000singlemanual.pdf
e. The sensor has an optional cable and software from Telaire for connecting to a PC the docs for that are here http://www.edinst.com/pdf/telaire/uip8000manual.pdf
f. I read in an old forum post about someone having a CO2 sensor that "put out a 0-10VDC signal that represents a 0-2000
ppm reading" and I noticed this device has a 0-10v Output... Could this sensor work like that?
Now, I am trying to avoid paying out $54+ for a 200kbyte Visual Basic app and what I think is a simple 2 wire to DB9 Cable made only for connecting to a PC which in the end I do not even need. I understand without paying for their cable and software I do not have much hope of figuring out how to configure the device via the RS232, since I assume they have command codes sort of like the LCD I used. I do not mind much since the default config at the factory will work for what is required. The first stage of my plan includes trying to connect the sensor via a homemade cable to my computer and reading the outputs via hyperterminal or something of the like. I would think that since they have PC software to read the outputs it must output something readable via the serial port which will give me a starting point for connecting it to the BS2.
With all that said I am off to do some heavy reading. If someone has worked with these sensors before any info would be a great help and if it comes down to it I guess I will just have to buy the software/cable kit and work off the info that gives me...
***Edit***
Power question:
The sensor requires 18-36V rms OR 18-42VDC 100mA Peak, 70mA avg @ 24VDC
Am I correctly thinking that this 13.5-30VDC/1000mA AC-to-DC Adapter from radioshack Model: 273-1668 | Catalog #: 273-1668 will do the job?
I am 99.9% the ratings on the AC to DC adapter mean the most it can output is 1000mA @ 30VDC which would mean the sensor at 30VDC would draw 80ish mA ? *ball park guess I did not do the math this second* If that thinking is correct it should work fine right?
Thanks in advance,
Brann
Post Edited (Brann Fenix) : 8/31/2006 4:25:34 PM GMT
I am working on a little side project for a friend of mine which requires a Telaire 8001 CO2 sensor. I have only really worked with a TTL LCD as far as interfacing via serial communication with the BS2, so this is new stuff for me. I just wanted to ask for some ideas and run some stuff by everyone before I ever power this sensor up and risk damage. Here is what I know:
a. The sensor using RS-232 and has an optional cable and PC software. This means I will need something on the lines of a MAX232 in order to connect to it.
b. The pin out for the sensor is as follows:
Pin 1 = Not Used
Pin 2 = Not Used
Pin 3 = Relay Normally Open
Pin 4 = Relay Common
Pin 5 = Relay Normally Closed
Pin 6 = 4-20mA Output
Pin 7 = Signal Ground
Pin 8 = 0-10v Output
c. The docs for the sensor are here http://www.gesensing.com/downloads/manuals/8000singlemanual.pdf
e. The sensor has an optional cable and software from Telaire for connecting to a PC the docs for that are here http://www.edinst.com/pdf/telaire/uip8000manual.pdf
f. I read in an old forum post about someone having a CO2 sensor that "put out a 0-10VDC signal that represents a 0-2000
ppm reading" and I noticed this device has a 0-10v Output... Could this sensor work like that?
Now, I am trying to avoid paying out $54+ for a 200kbyte Visual Basic app and what I think is a simple 2 wire to DB9 Cable made only for connecting to a PC which in the end I do not even need. I understand without paying for their cable and software I do not have much hope of figuring out how to configure the device via the RS232, since I assume they have command codes sort of like the LCD I used. I do not mind much since the default config at the factory will work for what is required. The first stage of my plan includes trying to connect the sensor via a homemade cable to my computer and reading the outputs via hyperterminal or something of the like. I would think that since they have PC software to read the outputs it must output something readable via the serial port which will give me a starting point for connecting it to the BS2.
With all that said I am off to do some heavy reading. If someone has worked with these sensors before any info would be a great help and if it comes down to it I guess I will just have to buy the software/cable kit and work off the info that gives me...
***Edit***
Power question:
The sensor requires 18-36V rms OR 18-42VDC 100mA Peak, 70mA avg @ 24VDC
Am I correctly thinking that this 13.5-30VDC/1000mA AC-to-DC Adapter from radioshack Model: 273-1668 | Catalog #: 273-1668 will do the job?
I am 99.9% the ratings on the AC to DC adapter mean the most it can output is 1000mA @ 30VDC which would mean the sensor at 30VDC would draw 80ish mA ? *ball park guess I did not do the math this second* If that thinking is correct it should work fine right?
Thanks in advance,
Brann
Post Edited (Brann Fenix) : 8/31/2006 4:25:34 PM GMT