Omron CQM1H-SCB41 Operation Manual page 419

Sysmac cqm1h series serial communications board

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Hayes Modem AT Command Protocol

The connections when using the Hayes Modem AT Command Protocol is shown below.

RS-232C Connection

Modem: D-sub

25 pin (female)

Compatible Modems

Although most of the sequences in this protocol can be used regardless of modem, the sequences Initialize

Modem (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).

Telephone line

CQM1H D-sub 9 pin

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