What theodolite?

[jjb299]

Den, thanks for clarifying on the CO-OP unit.
OP: If you want to see if the data collectors are talking the same Geodimeter "language", you could always wire tap into the TX signal line of the serial port and read what it is saying using a program like Putty or Hyperterminal. Try to find a command that is common to all 3 data collectors, like "send zero angle to instrument". Conversely, if you borrow a total station from someone, tap into the RX line to see what the instrument is saying.