Remote-processing RPC-210 User Manual Page 13

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SETUP AND OPERATION SECTION 2
Page 2-7
5. Receiving a sign on message and can't enter
characters.
Check U9, pin 14 for at least -6 volts with the serial
cable connected to the PC . W hen it is near 0 volts,
the terminal or PC' s Txd line is not connected.
When you press a character on the terminal or PC,
you should see the voltage go positive on the
oscilloscope.
If all of this fails, call technical sup port listed in
SECTION 1.
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