DDA225-01 Dual RS-232 to RS-422/485 Monitor/Converter
This product provides an ideal aid to testing and faultfinding RC&M Systems.
Converts two PC-compatible RS-232 ports to RS-422 or RS-485 (including transmitter tri-state).
One channel may also act as monitor, and has a patch panel to support varying pinouts.
Data Sheet: DDA225.PDF.