Listing ID #3436589
Company Information
Ask for more detail from the seller
Contact SupplierThe 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.