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North Star HSIO-4
TERMINAL OR MODEM
To establish an RS-232 communication link
between two electronic devices, one device
must simulate a modem; the other must
simulate a terminal.
port simulates a modem.
COMPUTER TO TERMINAL COMMUNICATION
If the HORIZON is to communicate with a serial
terminal (such as a video terminal or a
printer) , the interfacing port on the HSIO-4
must be configured to simulate a modem.
COMPUTER TO MODEM COMMUNICATION
If the HORIZON is to communicate with a modem
or acoustic coupler, the interfacing port on
the HSIO-4 must be configured to simulate a
terminal. As supplied, each port is configured
to simulate a modem. To configure an HSIO-4
port as a terminal, you must wire the
Configuration Header for the relevant port
according to the specific procedures in
Section 3.2.2 for asynchronous operation or
Section 3.3 for synchronous operation.
COMPUTER TO COMPUTER COMMUNICATION
The HORIZON can communicate with another
computer if one computer simulates a modem
while the other simulates a terminal. As
supplied, each port on the HSIO-4 board is
configured to simulate a modem; it is ready to
communicate with a computer that simulates a
terminal.
16
As supplied, each HSIO-4
Figure 3-2
User/Technical Manual
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