AT Commands
Table 2-3. DTE Baud Rate
Switch 1 | Switch 2 | Baud Rate (bps) |
| | |
OFF | OFF | 1200 |
OFF | ON | 2400 |
ON | OFF | 9600 (default) |
ON | ON | 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