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RS-232↔IEEE 488 INTERFACE CONVERTER
Vtest Test Voltage—Output—Pin 6
This pin is connected to +5 volts through a 1K resistor. It is also common
to Vtest on Pin 9.
Gnd Ground—Pin 7
This pin sets the ground reference point for the other RS-232 inputs and
outputs.
Vtest Test Voltage—Output—Pin 9
This pin is connected to +5 volts through a 1K resistor. It is also common
to Vtest on Pin 6.
+RxD Receive Data Plus—Input—Pin 14
This pin accepts serial data sent by the RS-422 host. The serial data is
expected with the word length, baud rate, stop bits, and parity selected by
the internal switches. The signal level is high true and only connected to
this pin when RS-422 operation is selected. It is 180 degrees out of phase
with -RxD.
+TxD Transmit Data Plus—Output—Pin 16
This pin transmits serial data to the RS-422 host. The serial data is sent
with the word length, baud rate, stop bits, and parity selected by the
internal switches. The signal level is high true and only connected to
this pin when RS-422 operation is selected. It is 180 degrees out of phase
with -TxD.