RS232 CONVERTER
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The unit is a port powered two-channel (half-duplex) RS-485 to RS-232 converter. It converts the balanced halfduplex RS-485 signals to TD and RD RS-232 lines. The unit is powered from the RS-232 data and handshake lines whether the lines are high or low. An external power supply can be connected to two terminals on the RS-485 connector if no handshake lines are available. Although the converter uses handshake lines to power itself, no handshaking is required to control the RS-485 driver. The RS-485 driver is automatically enabled during each spacing state on the RS-232 side. During the marking or idle state, the RS-485 driver is disabled and the data lines are held in the marking state by the 4.7k ohm pull-up and pull-down resistors. The value of these resistors may need to be changed to a different value when termination is used in order to maintain the proper DC bias during the idle state.