232CL9R0900 – pg. 2/2

© B&B Electronics - January 2000

This product designed and manufactured in USA of domestic and imported parts by

Note: The T+ & T- indentification doesn't imply a

direct connection across the transmitter.

Note: The R+ & R- indentification doesn't imply a

direct connection across the receiver.

Figure 2. Connection to an Active Current Loop

RS-232

to

Current

Loop

Converter

T+

R+

R-

T-

Active Current

Loop Port

R-

T+

T-

R+

Vs

Vs

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.

+12VDC

Figure 3. Connection to a Passive Current Loop

470

22

R+

R-

23

25

RS232 TO CURRENT

LOOP CONVERTER

470

T-

19

21

9

6

T+

14

T+

YOUR

EQUIPMENT

T-

PASSIVE CURRENT

LOOP CONVERTER

R+

R-

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.

+12VDC

Figure 4. Interconnection of Two Current Loop converters

470

22

R+

R-

23

25

470

T-

19

21

9

6

T+

14

470

22

R-

R+

23

25

T-

470

19

21

9

6

14

T+