RS232 to RS485 Converter Kit

SKU
KC485
In stock
$14.95
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Overview

Plug into PC's serial port (DB-9) directly.

Extends the communication range over 1KM with speed of 115K bit/s.

Power Supply: (9V/100mA)

ASSEMBLY REQUIRED

DIY KIT KC485 RS232 TO RS485 CONVERTER

Plug into PC's serial port (DB-9) directly
Extends the communication range over 1KM with speed of 115K bit/s
Small power consumption (9V/100mA).
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RS232 to RS485 Converter Kit ~ Electronic kit

INTRODUCTION
This is a low cost non-isolated RS232 to RS485 converter which can be plugged into PC's serial port (DB-9) directly. Hence it extends the communication range over 1KM with speed of 115K bit/s easily. The power consumption is small and a 9V/100mA (2.1mm center positive) plug pack will do fine.

OPERATION
Since KC485 supports only half-duplex communication, the direction of communication is controlled by the RTS (Request-to-send) signal of the PC. If the RTS is inactive, the KC485 is in receive mode. While the RTS is active, the KS485 is in transmit mode. For normal operation, always put the KC485 in receive mode unless transmission is needed. (Make sure the last bit has been transmitted before switching back to receive mode) 32 units of KC485 can be connected in parallel to form a small communication network. (Remark: the terminating resistor R6 and the biasing resistors R7, R8 should be removed from the circuit, they can only presented on both ending units)

CIRCUIT DESCRIPTION
The circuit is pretty straight forward. U1 converts the RS232 signals from PC to logic level. Then the logic level is converted to RS485 signals by U2. U3 provides stable 5V power supply. Three LEDs are added for diagnostic. D3 lites up in receive mode and goes off in transmit mode. D2 flashes when transmitting. D1 flashes when receiving.