connector is not standard and is hard to find. Pin-out information
can be found in the IBM PCjr Technical Reference Manual. Some
dealers sell a 'IBM PCjr Adapter Cable for Serial Devices' that
converts the connector on the PCjr to standard RS-232-C. The
cable attaches between the PCjr and the PK-900 Serial Cable.
2.6.4 Tandy Color Computer
The CoCo series (except for the Micro CoCo) uses a four-pin DIN
connector for its serial interface. Wire a cable as shown below. All
necessary parts should be available from your Radio Shack dealer.
CoCo PK-900 (DB25P)
4 ..................... 2
2 ..................... 3
3 ..................... 7
2.6.5 Tandy Model 100/102 and NEC 8201
The Model 100/102 and NEC 8201 have built-in standard RS-232 serial
ports which are compatible with the PK-900. You'll need a DB-25
male-male gender changing adapter to use the supplied PK-900 Serial
Cable.
2.6.6 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-900 in the same way.
Your PK-900 is configured as Data Communications Equipment (DCE)
which receives data on pin 2 of the 25-pin DB-25 connector or pin 2
of the 25 pin cable supplied with the unit. Most computers and
terminals are configured as Data Terminal Equipment (DTE)
transmitting data on pin 3 of a DB-9 or pin 2 of a DB-25 RS-232
connector.
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:
You may want to purchase a Null Modem adapter from Radio Shack
(Part # 26-1496) or other computer store.
You may also wire your own cable directly to the PK-900's DB-25
connector by wiring the Transmit Data (TXD), Receive Data
(RXD), and the Signal Ground (GND) to a DB-25P (Male)
connector as diagramed below:
1/93 2-10
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