RS232 modbus pinout

[BK1020]

I'm trying to use MODBUS to send the speed and position of a motor from the motor controller to LabVIEW.  The vendor sells cables that go from the serial port of the controller to a computer and use RS232 communication.  I was wondering what the pinout for RS232 communication is for LabVIEW so I can be sure that the cable I'm purchasing will work.

Thanks,

Bryan

[LV_Pro]

The pin out is not LabVIEW specific, it is whatever your serial port is set up for. The standard pinout for RS232 may be found here. Whether you need all the signals or just the tx/rx & gnd depends on your interface. pins 3 & 2 are sometimes reversed (null modem) and there are adapters to do that if you don't want to try and swap pins.