What You Need To Know; The Rs-232 Interface; The Synchronous Adapter Card - US Robotics COURIER User Manual

COURIER HIGH SPEED MODEMS
answering. If you have a personal computer, however, you
must find out what hardware and software you need before
setting the Courier for synchronous calls.
What You Need to Know
The network's communications management staff can supply
information on the following requirements:
• The protocol needed for your calls
• The software support needed to log into the network, for
example, a specific communications package or interface
board
• The phone number, if you will be calling instead of
answering
• Whether you need to change the duration of the
modem's Request to Send/Clear to Send (RTS/CTS)
delay. Once the Courier establishes a synchronous
connection, it waits 10 milliseconds (the default value)
after receiving an RTS signal from the DTE before
responding with a CTS signal.
If it's necessary to change the duration of the RTS/CTS
delay, you need to reset Register S26. See the S-Register
Summary in Appendix B.
• Any restrictions about when you can call
The RS-232 Interface
Transmit and Receive synchronous timing pins are required at
the RS-232 interface. You'll need either pin 15 or pin 24 for
Transmitter timing signals, depending on whether the modem
(pin 15) or the DTE (pin 24) generates the signals. You'll also
need pin 17, for Receiver timing signals. If you're using an
interface adapter card, described below, the adapter will
implement these pins. If you're building your own cable, review
the RS-232 Interface, in Appendix B.
The Synchronous Adapter Card
As a rule, personal computers do not support synchronous
communications. You will probably have to purchase and install
7-2 Synchronous Operations
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