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Appendix NHayes Modem AT Command Protocol
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Connections
The connections when using the Hayes Modem AT Command Protocol is shown below.
RS-232C Connection
Modem
Telephone line
Modem
Modem: D-sub
25 pin (female)
CQM1H D-sub 9 pin
(female)
Compatible Modems
Although most of the sequences in this protocol can be used regardless of modem, the sequences Initialize Mo-
dem (specialized) and Dial sequences can be used only for the following Modems:
• MD24FB10V (OMRON Modem)
• MD144FB5V (OMRON Intelligent Modem)
• ME1414VB2/B2 (OMRON FAX/DATA Modem)
For other modems, create a modem initialization sequence using the general-purpose Initialize Modem sequence
and dial using the Data Send/Receive sequence (Sequence No. 553).