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Q: What is the difference between RS-485 and RS-422 mode in Systech products?
   
A: RS485 and RS422 use the same electrical interface circuits in the Systech products. The difference between the two is in how the electrical interfaces are used. RS485 mode is assumed to be used in a two-wire, half-duplex setup. In this case, the port server only listens to the receive lines when it is not transmitting, and tri-states the output lines when it is not transmitting. RS422 mode is assumed to be used in a four-wire, full-duplex setup. In this case, the port server listens to the receive lines all the time and always drives the output lines.
    Answer Last Updated: June 5, 2008

 

 
 

F.A.Q.

Deterministic Telnet Daemon

Allows you to have telnet sessions and to specify which PTY device to use for an incoming telnet connection, rather than arbitrarily picking a PTY device.This allows you to have the same tty name every time you log in. Available for UNIX

r4000 Utility

Provides command line uploads and downloads from the RCS/4000. Allows you to script updates of software and configurations for your field installation. Available for UNIX and Windows 95/98/NT/XP

rtn Utility

Creates a pseudo-tty (pty) device on the host that is connected via TELNET or raw TCP to an RCS/4000 serial port. Allows UNIX programs such as tip(1C) and uucp(1C) to access serial device attached to RCS/4000 ports. Available for UNIX