B&B Electronics 232CLDR - Quick Start Guide User Manual
Page 2
Documentation Number –p/n 8677R1 232CLDR-3512qsg
©2012 B&B Electronics Manufacturing Company
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Connect your PC to the RS-232 side.
Place a jumper between Terminal G & L and
Terminal H & J.
Using hyper terminal or similar program, connect
to the appropriate COM port. Turn off hyper
terminal local echo.
Transmit data. The same data should be returned.
Data LED will indicate data being transmitted.
3. To determine if your current loop device is
“active” or “passive” a multi-meter is required.
Set the meter to DC Volts and put the positive
(red) lead on the T+ line and the negative
(black) lead on the T- line of the current loop
device. If a voltage is displayed on the meter,
your device is active.
4. The following is an example of how to extend
RS-232 using two 232CLDR Current Loop
Converters. The converter on the left is
configured as “active” the converter on the right
is configured as “passive.”
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1. The 232CLDR has one optically isolated 20 mA
transmit loop and one optically isolated 20 mA receive
loop. Each loop can be set to either “Active” or
“Passive. When set to “Active” an isolated 20 mA
current is supplied for each loop (transmit and
receive). The same power supply provides power to
the converter and both current loops.
2. The 232CLDR can communicate at baud rates up to
19.2 kbps and distances up to 2000 ft (600 m).