22
greater or equal to 0.10pH or else the analog output will be
disabled.
VII. RS485 INTERFACE OPERATION
A.
INTRODUCTION
This section assumes you are familiar with the basics of data
communication, the RS485 interface, a rudimentary knowledge and
a copy of the more popular Windows
®
9X, XP computer
languages capable of using a PC RS485 card or RS232-RS485
converter (
third party vendor
) module.
A simple program must be written in order to send your command
and receive data from the meter.
A sample source program in Visual Basic
®
6.0 is included in the
accompanying disk.
B.
PREPARING THE METER
This meter comes equipped with a 2-wire RS485 interface. Just
connect each terminal to the respective RS485 terminal on your PC.
(If the DEMO program is not working, try reversing the connections
of the terminals.) After you have connected correctly the meter (or
multiple meters with unique ID number) and turned on both the
meter(s) and the computer, you are now ready to program a simple
routine to read data from the instrument.
VIII. ERROR DISPLAYS AND TROUBLESHOOTING
LCD
display
ATC
display
DISPLAY
unit
Possible cause(s)
[Action(s)]
