RS232 Cables and Long-Distance Transmissions

Sure, try BlackBox.com or others.

Try reading the Wikipedia articles on these two transmission methods for the basics.

hi,

you could use rs232 to fibre converters. then the distance is not really an issue. i have successfully transmitted rs232 over 150m without conversion. but this comes down to cable selection, route followed (interference) and speed selection.

Read http://www.arcelect.com/rs232.htm

rgds

dave

Yes, one of the RS232 to RS485 converter is ADAM 4520 from Advantech.. Check it out..

hi,

i use the adams converters myself, but did not want to push a particular product here.

Mine have been in operation for about 7 years, running 24/7. Zero failures!

rgds

dave

Yes, we are running a number of network monitoring installations on RS485 networks via a RS232/485 converter on the serial port. Most are a total length of about 800m with up to 25 sensors (temperature Pt100 and Dallas one-wire, humidity).

We have used ADAM, Nudam and TOPS Expert modules, and they all work OK. Like the one below (which also has a relay module for alarm purposes. They all started in the same factory at one time. To overcome some network cabling physical interferences and ease of installation, we have designed and implemented a wireless transceiver to the 485 network, having the capability of mix of cable and wireless on the same 485 network. Some sensors will be on a transmitter, some hard wired. If distance, line of sight or obstruction is an issue, just add another transceiver to bridge the gap.

The RS232 port has always been foolproof, our only problems have been using USB and WindowsXP in the way com ports are allocated and the nuances of some the USB/serial cable drivers.