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3.2
3.2.1
CONFIGURING PORT AS MODEM
North Star HSIO-4
ASYNCHRONOUS OPERATION
To establish a communication link between two
electronic devices, one device must simulate a
modem while the other simulates a terminal. If
the HORIZON is to communicate with a serial
terminal (such as a video terminal, a
teletype, or a printer), then the relevant
HSIO-4 port must be configured to simulate a
modem. Similarly, if the HORIZON is to
communicate with a modem, then the relevant
HSIO-4 port must simulate a terminal.
As supplied, each port on the HSIO-4 is
configured as a modem; it is ready for
connection to an RS-232 terminal. If a port
has ever been reconfigured as a terminal, it
can be restored to its original configuration
as follows:
1.
Remove the Clock Header (if there is one
present) from the Clock Header socket.
Please Note: As supplied, Clock Headers
are not installed on the HSIO-4 board.
However, if a port has been configured for
synchronous operation, then a Clock Header
will have been installed and must now be
removed.
2.
Check the shunt in the Configuration
Header socket; it should have the
following pins connected. (If the original
shunt is no longer available, then make up
a header with the same connections.)
pin
1 to pin 16
pin
2 to pin 15
pin
3 to pin 14
pin
4 to pin 13
pin
5 to pin 12
pin
6 to pin 11
pin
7 to pin 10
pin
8 to pin 9
24
\
*1 .
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t
t
t
1
i:
5\
4
7
3\
2'
9
12/ 13
14/ 15
•ch
a /
a h
a t
a t
ah
Figure 3-6
User/Technical Manual
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