how do I send pulse train through RS-232

[mcclements]

I've purchased an RF transmitter and receiver with the RS-232
interface to control a remote control device from my laptop. I need to
send PWM (pulse width modulated signals) to the reciver to control
some servos. All examples I have seen only involve DIO cards. Is it
possible for LabVIEW to send a pulse train through RS-232?