B&B Electronics 232CL9R Manual de usuario

232CL9R0812 1

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

9-Pin RS-232 to

Current Loop Converter

Model 232CL9R

Documentation Number 232CL9R-0812

This product Designed and Manufactured

of domestic and imported parts by

International Headquarters

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA

Phone (815) 433-5100 -- General Fax (815) 433-5105

Home Page: www.bb-elec.com

Sales e-mail: orders@bb-elec.com -- Fax (815) 433-5109

Technical Support e-mail: support@bb.elec.com -- Fax (815) 433-5104

2 232CL9R0812

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

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.

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.

232CL9R0812 3

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Figure 1.

4 232CL9R0812

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

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.

232CL9R0812 5

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

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.

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