SG-232A
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User’s Guide for SG-232A    RS232 photoelectric isolation protector

       many communications devices which RS232 standard is used, the equipment of powers supply system grounding, and many other reasons, making the earth potential between two devices is more than the normal rate. So the vertical interference was brought to the system. Even worse, the communication interface may be damaged. SG – 232A is designed to solve the problem above. The use of the photoelectric isolation makes no electrical contact between devices, only photoelectric transport.  When this product is connected between RS232 communications port and the original cable, the two can be separated by optical. Anti-lightning system built-in will ensure the safety of the circuit.

      This product can isolate all RS232 signal. This product’s appearance designed as DB25/DB25 adapter box, and it is connected between the serial ports of the RS232 of the DTE and the cable on-line. One end of DB25M (needle Block) connect with cable, the other end of DB25F (Hole Block) connect with 25-pin of RS232 socket (DTE).If the serial ports of the RS232 only has 9 pins, a 9-25 converter is needed to connect between the RS232 and DB25F.

Its corresponding connection is as follows:

9pin

1

2

3

4

5

6

7

8

9

25pin

8

3

2

20

7

6

4

5

22

signal

DCD

RXD

TXD

DTR

GND

DSR

RIS

CTS

RI

Technical parameters:

1. Optical isolation voltage: 1000 VDC.

2. Power: without an external power supply and the Serial Port don’t need initializes for power

3. The largest communications distance: 30 m.

4. Telecommunications rate: 57600 bps.

5. Transmission lines: 0.75 mm2 or more, ordinary or twisted pair wire.

6. Work: full-duplex, isolate all RS232 signal.

7. Dimensions: 120 × 50 × 17.

8. Weight: 40.

9. Temperature: -20 ~ +70 ℃.

10. Humidity: 0 to 95%

Note: This product is filling plastic seal before manufactured; the quality problems will not be responsible for manufacturers if user open it.

Software:

       Because this product doesn’t need to initializes RS232 serial port to get power, it’s applicable to all communications software, plug and play. You don’t need to make any changes on software when using this product.

Wiring:

     The DB25M (needle Block) and DB25F (Hole Block) of this product are complied with the 25 pins RS232 standards. It sends all RS232 signal. When using this product, the DB25F (Hole Block) (or by 9-25 converter) should connect with the RS232 serial port of the DTE equipment directly, and DB25M (needle Block) connect with the original on-line cables. As shown below: