232CL9R0812 – pg. 1/2
B&B ELECTRONICS
9 Pin RS-232 to Current Loop
Converter
Model 232CL9R
The Model 232CL9R is a passive 9 pin RS-232 to current loop
converter. This converter requires a 12VDC-power supply at 100mA.
Additional resistors are supply for an active source.
PRODUCT INFORMATION
Figure 1.
www.bb-elec.com
orders@bb-elec.com
support@bb-elec.com
International Office:
707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office:
Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
232CL9R0812 – pg. 2/2
B&B ELECTRONICS
PRODUCT INFORMATION
To connect the converter to an existing current loop port, you must first determine if the port is active or passive.
For a port to be active, it must have an internal power supply which provides the 20mA current for the transmitter,
receiver, or for both. This information should be available in the instruction manual. If the instruction manual is
not available the simplest way to determine this is to break the loop (disconnect it) and see if there is any DC
voltage across the output or input pairs.
Current loop interfaces normally consist of four wires. They are usually labeled T+, T-, R+, and R-. T+ and T- are
the transmit plus and transmit minus lines and data is output from that device on those lines. The R+ and R- lines
are the receive plus and receive minus lines and data is input into that device on these lines.
Interconnection of the two current loop devices is different depending on whether your unit is active or passive.
Connection to an active current loop port is very simple. Your unit’s T+ and T- lines go to the B&B unit’s R+ and
R- lines, and your unit’s R+ and R- lines go to the B&B unit’s T+ and T- lines, as shown in figure 2.
Connection to a passive current loop port requires a 12 VDC power supply. Use the 470 ohm resistors inside of
our converter to create a 20 ma current source, as shown in figure 3.
Interconnection of two B&B current loop converters also requires the use of a 12 VDC power supply since they
are both passive ports. See figure 4.
www.bb-elec.com
orders@bb-elec.com
support@bb-elec.com
International Office:
707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office:
Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
