AT Commands
Table 2-3. DTE Baud Rate
Switch 1
Switch 2
Baud Rate (bps)
OFF
OFF
ON
ON
OFF
ON
OFF
ON
1200
2400
9600 (default)
19,200*
* If you select 19,200 bps, set switch 6 ON to enable
hardware flow control.
DTR Dial Enable
Using pre-programmed Telephone/Mobile Identification numbers, your RTU can originate calls
to its host using the RS-232 Data Terminal Ready (DTR) signal. To enable this feature, set
switch 7 to the ON position. Then use the
AT*DTR
command to assign the number that the
OMEGA CDMA Modem is to dial (see Table A-4 on page 22). Then, when the RTU raises its
DTR signal, the modem automatically dials the stored telephone number and attempts to
establish a data connection. Once a remote connection is made, a drop in the DTR signal ends
the connection.
Attaching a DTE Cable
Note:
If the stand-alone OMEGA CDMA Modem is purchased from Telenetics, the RS-232
connection has already been made and this section can be skipped. However, if the
Marwell socket adapter option is purchased from Telenetics or if the RS-485 interface
is to be used, please read this section.
The OMEGA CDMA Modem provides two DTE connectors:
One for an RS-232 connection.
One for an RS-485 connection.
Both of these connectors are RJ-11 jacks. Only one of these connectors should be used at a time.
Switch 8 on the OMEGA CDMA Modem controls which of these connectors is enabled (refer to
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