Kantronics KAM, Руководство пользователя

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Chapter 2 - Connecting your Computer
9
This is known as a three-wire interface. This cabling supports the TRS VIDTEX program. If you
have a micro-color computer, such as the MC-10, cabling is different; consult your computer refer-
ence manual.
TRS MODEL-100
This computer has a standard RS-232 25-pin DB connector serial port. Just add necessary ex-
tension cables and call the modem program that is a part of the computer.
OTHER COMPUTERS WITH A 25-PIN SERIAL CONNECTOR:
If your computer has a 25-pin DB connector for serial operation, chances are it is wired the
same as the KAM. However, it is a good idea to check the computer reference manual before wir-
ing up the cable. Check to make sure that transmit data, receive data and ground are on the same
pins as the KAM serial port. Change if necessary. Also check to see whether or not the RTS/CTS or
other RS-232 lines are required. The requirement for these lines is usually dictated by the com-
puter program you use.
Your computer may also require jumpers between pins 4 and 5, and also between some combi-
nation of pin 6, 8 and 20. Check your computer reference manual.
CONNECTING KAM TO YOUR COMPUTER
NOTE: Before making any connections to the KAM, you should review the internal jumpers
information in Chapter 3, page 13.
The 25-pin connector on the panel is for connecting to the computer or terminal. Five of these
pins are for connection to your computer or terminal, and two provide for Mark/Space outputs to a
monitor scope if you wish to use one. A prewired cable is provided for your use to connect the
KAM to the computer. Five prewired lines are provided with a DB-25 connector. You must provide
the connector to attach these lines to your computer serial port. In most cases, unless the terminal
program you use requires hardware flow control, you need only connect three of these lines –
Transmit data, Receive data and Signal ground. In fact, most modem programs do not use
RTS/CTS handshaking supported by the KAM. Therefore, the three lines interface is best when first
starting.
Description Comp. pin Direction KAM pin Color
Transmit data
Receive data
Request to send
Clear to send
Data carrier detect
Signal ground
Data set ready
Data terminal ready
Mark
Space
+12 V 2
3
4
5
8
7



2
3
4
5
8
7/1
6
20
11
18
25
white
brown
green
red
black
The function of these lines is explained below.