PK-232 MBX – OPERATING MANUAL COMPUTER INSTALLATION
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2.6.2 Other Computers with Non-Standard Serial Ports
Computers with non-standard serial ports must meet the following conditions:
o The signal levels must be compatible with RS-232-C. The PK-232 requires the volt-
age levels from the computer be greater than +3 volts in the "asserted" state and 0
volts or less in the "nonasserted" state.
o The signal polarity must conform to the RS-232-C standard. The 0 or negative-volt-
age state must correspond to logical "1" and the positive-voltage state to logical "0".
o The computer must be able to correctly receive a signal that meets asynchronous
RS-232-C specifications. The PK-232 supplies signals that meet this specification.
Make or buy a cable that provides the following connections:
o The computer's serial port signal ground or common pin must be connected to the
PK-232's serial port connector pin 7.
o The pin on which the computer SENDS data must be connected to the PK-232's con-
nector pin 2.
o The pin on which the computer RECEIVES data must be connected to the PK-232's
connector pin 3.
If your computer requires any other signals, you must arrange to provide them. The PK-
232 has the standard hardware handshake lines available. As a default the PK-232 pro-
vides XON/XOFF software flow control to the computer or terminal. The command XFLOW
can be turned OFF disabling software flow control and enabling hardware handshake if
your computer requires it. The documentation provided with your computer or serial card
should clarify any special requirements.
2.7 Terminal (Modem) Software for Other Computers
Any communications program that enables your computer to emulate or act as an ASCII ter-
minal with a telephone modem should work with your PK-232. If you have a familiar pro-
gram you have used successfully, use it to communicate with your PK-232.
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