Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 39
Serial Multipoint Transmission RS-485
The RS-485 transmission standard allows several PWD22/52s to
communicate (half duplex) with the host computer using a single twisted
pair. For the RS-485 communication connect the PWD22/52 signal wires
to:
- BRN RS-485 A (+)
- WHT RS-485 B (-)
NOTE
In some RS232/RS-485 converters the markings may be mixed. If the
connection does not work properly, switch the position of the wires.
NOTE
In PWD11 User's Guide the RS-485 markings were mixed. The markings
are corrected in this manual. The actual wiring and wire colors are
identical in PWD11 and PWD22/52.
Connection of the Maintenance Terminal
Any computer equipped with terminal emulation software or a VT 100
compatible terminal with RS-232 serial interface can be used as a
Maintenance Terminal for PWD22/52.
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