This is just to confirm:
- The connections for the B707C are
- 3.0 V (2-3.3 range) to the pad marked '+'
0 V to the pad marked '-'
Numbering the 8 pads inboard of the '+' pad 1 to 8:
pad 1 is B707B Rx and should be connected to Arduino Tx
pad 2 is B707B Tx and should be connected to Arduino Rx
- And yes that seems to work just fine according to the codes given in above posts.
I used the attached sketch written by a friend to work for Teensy 3.6 Serial4.
All very simple and excessively obvious for some - but one has to start from somewhere.
Note that in using the IDE serial monitor, you will need to set the COM port to the speed set by Serial.begin
In the sketch it is the same as for the B707C but probably does not have to be.
There remains the mystery of what the other 6 pads on the B707C do.
One is probably to command a continuous series of measurements.
And, if you are excessively inquisitive, the other two connectors for flat ribbons. Probably for keypad and display in a handheld meter.
I should perhaps also add that if, having turned to aiming LED ON with an 'O', you then ask for a measurement with a 'D' or an 'M', the spotting LED is turned off as part of the B707C response.
PassThruS4.ino (1.04 KB)