User guide

IOLAN+, IOLAN+ Rack & IOLAN+ 102/104 User guide
RS-232/RS-422
Page 35
Chapter 1 Introduction
RS-232/RS-422
Functionally, the difference between RS-232 and RS-422 versions is the absence of support
for hardware flow control lines (RTS and CTS) and modem control lines (DSR, DTR and
DCD) in the RS-422 version. The performance and support for 115.2k baud are unaffected
by the different serial ports. RS-422 uses differential signalling and is capable of handling
longer distance due to superior noise immunity when installed with suitable cabling.
Software description
The IOLAN+ comes with the Perle CD. This CD contains the latest ‘released’ firmware and
the redirector software for Unix systems called ioland. The firmware is a backup copy and
generally not used. The ioland software is used for setting up printers and dial-out modems
on Unix. The IOLAN+ uses TFTP for downloading new firmware. tftpd is included with Unix
systems such as SCO, AIX and HP-UX but disabled by default. Consult your Unix manual on
this subject. On Windows ® , tftpd is not provided at this time (see our web site for a
shareware tftpd program www.perle.com)
.