Chapter
I
Communications protocol
The following criteria must be met before computer-to-computer communi-
cation can occur.
1.
Both computers must have the same communications protocol:
300
bitdsecond (bps)
Word length
(7
bits or
8
bits)
Parity (even, odd or none)
Number of stop bits
(1
or
2
bits)
See your computer owner's manual for instructions on setting the com-
munications protocol.
2.
One modem must be in originate mode and the other must be in answer
mode. Usually, when you call another computer, you should be in
originate mode. When you receive a call, you should be in answer mode.
The Modem provides automatic and manual operations in both originate
and answer modes. When opened for programming by the attention code
sequence, it will automatically synchronize the speed rate, word length, par-
ity and stop-bit numbers (communications protocol)
of
your computer system.
Helpful
Tip:
When you use your Modem for the first time or when you seem to be getting
garbled data, use the self-test mode to help you find the cause of the problem.
Refer to the section on
self-test
in Appendix A,
Command reference.
Refer also to the operation manual which accompanies your communica-
tions software package.
15
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