The I-7551 Photo coupler provides a complete full-duplex (including control signal) electrical isolation channel between two RS-232 devices. This isolation is an important consideration if a system uses different power sources, has noisy signals, or must operate at different ground potentials.

The I-7551 provides the option of reconfiguring which control signal is used. CTS can be selected instead of DSR, and RTS instead of DTR.

The I-7551 incorporates two DC-to-DC converters, the isolation site of the I-7551 is located in the input and output interface circuit. In other words, the I-7551 is 3-way isolation RS-232 to RS-232 repeater. back •3000 VDC 3-way Isolation Protection •ESD Protection •Power Input, +10 ~ +30 VDC •Baud Rate, 300 ~ 115200 bps •Operating Temperatures, -25 °C ~ +75 °C •DIN-Rail back Interface Input TxD, RxD, CTS, RTS, GND or TxD, RxD, DSR, DTR, GNDJumpers JP1 and JP2 are used to select the RS-232 input source type Output TxD, RxD, CTS, RTS, GND or TxD, RxD, DSR, DTR, GND Transfer Distance Max. 15 M at 115200 bps Speed 300 ~ 115200 bps ESD Protection Yes 3000 VDC Three Way Isolated Protection Yes Connection RS-232 Input 9-Pin Female D-Sub RS-232 Output 9-Pin Male D-Sub LED Indicators Power/Communication Yes Power Input Voltage Range +10 VDC ~ +30 VDC (Non-isolated) Power Consumption 1.2 W Mechanical Casing Plastic Flammability Fire Retardant Materials (UL94-V0 Level) Dimensions (W x H x D) 72 mm x 118 mm x 35 mm Installation DIN-Rail Environment Operating Temperature -25 °C ~ +75 °C Storage Temperature -30 °C ~ +75 °C Humidity 10 ~ 90% RH, non-condensing back

I-7551 CR Isolated RS-232 to RS-232 Converter (RoHS) I-7551-G CR Isolated RS-232 to RS-232 Converter (Gray Cover) (RoHS) back GPSU06U-6 24 VDC/0.25 A, 6 W Power Supply DIN-KA52F 24 VDC/1.04 A, 25 W Power Supply with Din-Rail Mounting