Connecting A Terminal To The Computer; Checking Installation - Tandy TRS-80 Service Manual

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2.4. Connecting
A
Terminal To The Computer (see Figure 2-3)
First, check which connector you're using for the terminal.
If it is either SeriaI Channel A or B, you will need an
RS-232 cable (Cat. No. 26-4403) and a null modem adapter
(Cat. No. 26-1496) for each terminal.
1. Connect one end of the RS-232 cable to the terminal's
RS-232 jack.
2. Connect the other end of the cable to the female plug
of the null modem adapter.
3. Connect the adapter's male plug to either SeriaI
Channel A or B of your computer.
4. If the computer requires it (check the owner's manual),
insert a Terminator Plug into any unused SeriaI
Channel.
If the terminal connects to one of the three connectors on
the Multiterminal Interface
pca,
you will need only the
RS-232 cable assembly.
2.5. Checking Installation
Correct installation of the Multiterminal Interface is ensured
when the following commands typed into the computer running
XENIX produce the noted responses.
Type in the following command*:
disable ttyOX (enter)
Response
There will be no response or the following error message
will appear:
disable: ttyOX is already disabled
disable: /etc/ttys not updated (which is OK)
* OX
=
one of the tty terminaIs, either 4, 5 or 6.
For example, tty04.
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