RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
(OP)
I have a system that outputs serial data through Tx+ and Tx- pins through RS-422 format. Supposedly, these pins swing betwen 0V min to 6V max as a differential output. Instead of purchasing new RS-422 to USB cables, I already have some RS-232 to USB cables I want to use instead. Would there be any issues I can't think of if I connect the Tx+ and Tx- output pins directly to the RS-232's Rx and Gnd pins?





RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
RS232 voltages are NOT differential, they are referenced to ground. The voltages are ±15V nominal, though some operate as low as ±6V. Nominal RS422 voltages are ±2V.
Go here for a comparison, look at the chart near the bottom: http://www.rs485.com/rs485spec.html
Then shop for RS422 to USB converter. I suggest newegg.com, great prices and great service.
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
If you are SURE the voltage is only 0-5/6v, AND your cable length is less than around 10' (reason for differential vs rs232 - noise), then you probably can do as we have done in the past:
RS422 RS232
------------------------
T+ (or T-) -> R
R+ (or R-) -> T
COM -> COM
We have done this many times in the past to test signals and read the rs422 data on a rs232 only computer in a pinch.....
RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?
RE: RS-422's Tx+ and Tx- mapped to RS-232's Rx and Gnd... issues?