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Data Communications
DRIVER MODE
Examples:
Driver Mode is an additional multipoint feature available
with the Monitor Mode option to the 13260C and 13260D
interfaces. It allows you to use a terminal to control a
multipoint communication line. This technique is very
useful in developing communication drivers or testing
networks without the need of a computer or modem.
Figure 5-22 shows two typical networks using the driver
mode option. The network in figure 5-22a is the simplest
case. A more useful network is shown in figure 5-22b.
Here a multiterminal network is being driven while a
terminal in monitor mode is used to display or record all
communication transactions. All data from the
downstream terminals as well as the driver terminal is
displayed.
Once the Monitor/Driver Mode option has been installed
(refer to Section VII Installation for installation proce-
dures), Driver mode is selected as follows:
DVR-ABaB (uses terminal B in group A for both poll and
select)
DVR-A
II
aB
(polls all terminals in group A but selects
only terminal B)
Step 3.
_ .
Step
4..
l1li.
(The DISPLAY FUNCTIONS indi-
cator should blink)
The Driver will begin sending out the polling sequence at
4 to 5 second intervals using the poll ID characters loaded
with the ENTER key. You can also type in text to be sent
to the terminal identified for select operations. Block
transfers are triggered by the ENTER key.
Step 1.
III ,III , ...
Step
2. Type
DVR-
<
GI D DID)
<
9
i
d
DID).
Example: Thi5 i5 a block of text to be 5ent
to a terminal
where:
GID DID
=
The group and device IDs to be used in poll
sequences.
gid DID
=
the group and device IDs to be used in select
sequences.
This line would be sent to and displayed on the destination
terminal just as it was typed. Note that if a monitor ter-
minal were in the network between the driver terminal
and the destination terminal it would display all of the
framing characters as well as the block check character.
Figure 5-23 shows the way this transfer would appear.
_
I
Modems or Modem Bypass Cable
.~./~-~~,
~
'~,
TERMINAL IN
DRIVER MODE
(8)
MULTIPOINT
TERMINAL
MULTIPOINT
TERMINAL
MULTIPOINT
TERMINAL
TERMINAL IN
MONITOR MODE
One of these cables must be either a set of
modems or a Modem Bypass Cable.
I
\
TERMINAL IN
DRIVER MODE
(b)
Figure 5-22. Driver Mode Configurations
5-49
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