484
Hayes Modem AT Command Protocol
Appendix N
Connections
The connections when using the Hayes Modem AT Command Protocol is shown below.
RS-232C Connection
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)
ME1414B
III
, ME2814B
II
(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).
Modem
Telephone line
Modem
Serial Communications Board
(CS Series only)
Serial Communications Unit
(CS/CJ Series)
FG
SD
RD
RTS
CTS
5V
DSR
DTR
SG
FG
SD
RD
RTS
CTS
DSR
SG
CD
ST2
RT
DTR
CI
ST1
Modem: D-sub
25-pin (female)
Serial Communications Board/Unit
D-sub 9-pin (female)
1
6
5
9
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