Eia/tia-485 converters and laptop computers – Watlow CLS200 User Manual
Page 65
CLS200 Series User’s Guide
Chapter 2: Installation
Doc.# 0600-3050-2000
Watlow Anafaze
49
EIA/TIA-485 Converters and Laptop Computers
In order for an EIA/TIA-232-to-485 converter to optically
isolate the computer from the 485 network, the 232 and 485
sides must be powered independently. Many 232-to-485
converters can be powered by the computer’s communica-
tions port. Some computers, laptops in particular, do not
automatically provide the appropriate voltages. These com-
puter/converter combinations can usually be used by con-
necting an external power supply to the 232 side of the
converter. Not all converters have power inputs for the 232
side, however.
NOTE!
When using Anasoft with a laptop computer,
choose a converter with an external 232 pow-
er input. AnaWin and Watview works with all
tested converters without an external 232 in-
put.