PK-232 MBX – OPERATING MANUAL COMPUTER INSTALLATION
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If all of the above steps were successful, you've completed the system quick-check and
are ready to proceed to Chapter 3. In Chapter 3 you will connect your PK-232 to your radio
and begin using it "on the air".
If you have problems with the steps shown above, go back to Step 1 AFTER checking all ca-
bles and connectors. Read each step again carefully. The most common problems are trying
to connect to a call different from AAA, leaving the DCD LED on which inhibits transmit, not
having the green-and-white wires connected, or not setting the AFSK level to 50 % rotation.
If you still have problems, leave your PK-232 ON and contact Timewave's Technical Support
Department as suggested in the front of this manual.
2.6 Detailed RS-232 Connections for Other Computers
If the type of computer you plan to use with the PK-232 was not mentioned in the beginning
of this chapter, you may find specific connection information in the sections below. You will
also need a Communications program to use with your computer which AEA can not pro-
vide. See section 2.7 for information regarding Communication programs for many of these
machines.
Many computers require a serial port adapter card that incorporates the necessary RS-232-C
interface circuitry. The IBM-PC and Apple II series of computers are good examples of this.
Computers that do not have a serial port or do not permit use of a suitable adapter or level
converter cannot be used with the PK-232.
2.6.1 Other Computers with RS-232-C Ports
If your computer has an RS-232 port, consult your computer manuals to see which pins
are used for Transmit-Data, Received-Data and Signal-Ground. Read the manufacturer's
recommendations for connecting the serial port to a modem and connect your PK-232 in
the same way.
Your PK-232 is configured as Data Communications Equipment (DCE) which receives data
on pin-2. Most computers and terminals are configured as Data Terminal Equipment (DTE)
transmitting data on pin-2.
o If your computer is configured as DTE:
Use the supplied RS-232 cable with a Gender changing adapter if necessary. These
are available from Radio Shack (Part # 26-243) and other computer stores.
o If your computer is configured as DCE:
Wire pin 2 of the PK-232 to pin 3 of the computer connector.
Wire pin 2 of the computer connector to pin 3 of the PK-232.
Wire pin 7 to pin 7.
o As a default the PK-232 provides XON/XOFF software flow-control to the computer
or terminal. The command XFLOW can be turned OFF to disable software flow con-
trol and enable hardware handshake if your computer requires it. Hardware flow
control is achieved with RTS/CTS (pins 4 and 5) of the DB-25 RS-232 I/O connector.
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