All product specifications are subject to change without notice.

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UL Rated, Isolated

Current Loop Converter

Model 232CLDR

• Converts RS-232 to 20mA current loop

• 2000V optical isolation protection from transients

• One Transmit current loop & Receive current loop

• Current loops can be set to Active or Passive

• -40 to 80°C wire operating temperature

PRODUCT FEATURES

ACCESSORIES

MDR-20-24 - DIN rail mount power supply 24VDC, 1.0 A output power

DRPM25 - 35mm DIN rail to panel mount bracket, 25mm wide

ORDERING INFORMATION

MODEL

NUMBER

SERIAL

CONNECTOR

CURRENT LOOP

CONNECTOR

POWER SOURCE

FOR SERIAL SIDE

232CLDR

Terminal Block

Terminal Block

External Power Supply

Model 232CLDR is a DIN rail mountable RS-232 to current loop converter.

It is wide temperature rated and UL Recognized for industrial applications.

It has one optically isolated 20 mA transmit loop and one optically isolated

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). A 10 to 30 VDC power supply (required, not included) provides

power to the converter and both current loops.

The 232CLDR communicates at baud rates up to 19.2 kbps and can extend

communications up to 600 meters (2,000 ft.). 2,000V optical isolation protects

equipment from damaging ground loops and surges. Two LED’s indicate data

flow. Connections are made on terminal blocks.

232CLDR_3217ds

Current Loop Explained

Current loop devices use Current On or Current Off to transmit binary digits.

Current loop signals can often transmit over circuits that serial signals can’t

traverse reliably, due to distance, marginal conductors and electrical noise.

Current loop converters from B+B SmartWorx interface RS-232 to the most

common current loop ports – 20mA with open circuit voltages up to 30 V – at

a maximum baud rate of 19.2 kbps. High speed optical isolators couple and

isolate Transmit and Receive data. All B+B SmartWorx’ current loop converters

have a Transmit (T+ and T-) loop and a Receive (R+ and R-) loop. Each loop

may be operated as an active or passive loop. When the converter needs to

provide the loop current, a 12 VDC power supply is required for the current loop

side.

Contact B+B SmartWorx for information on modifications for higher loop

currents and voltages.