Passing digital IO lines in this manner is only available using the XStream family of radios.
Follow these instructions to configure a module to pass the DTR input on one module to the DCD output of a second module:
- Change the "DR" parameter to 1 on the radio(s) you want to transmit their Digital Input state. This instructs a radio to read its I/O line input (pin2 on the OEM module) and transmit any transition in its state.
- Ensure the "CD" parameter is set to 1 or 2 on the radio(s) you want to receive the transmitted Digital Input state and report at the Digital Output (pin 7 on the OEM module). This affects whether the I/O line output is default to logic 1 or 0, respectively. Note that on the OEM module logic 1 is +5VDC and logic 0 is 0VDC.
- On the OEM module when pin 2 is (de-)asserted on a transmitting radio, pin7 is (de-)asserted on a receiving radio.
- The ''''CO'''' parameter can be set from x00 (default-disabled) to xFF, which represents the OEM pin7 level timeout. Pin7 defaults to the level set by the ''''CD'''' parameter after no new status information is received during the timeout period.
- For RS-232 applications (using the Digi interface board), pin2 of the OEM module goes to DTR (pin4 on the DB-9 connector) and pin 7 on the OEM module goes to both DSR (pin6) and DCD (pin1), with the appropriate changes in TTL to RS232 voltage levels.
Important: If using the interface board the DIP switches will attempt to change a module''''s "CD" parameter the next time you power it on. To disable the DIP switches from rewriting "CD," install the jumper across J7 on the interface board.
Aug 08, 2017