Configuration
Dialup / Leased Line Modem
13
Configuration
To modify the configuration of a DLM the following will be required:
1. Computer with an available RS232 “COM” port.
2. Terminal Emulator such as Hyper Terminal.
3. Straight through RS232 cable to connect your computer to the DLM.
4. 12 to 30 volt power supply. The DLM typically draws 170 mA @12 VDC.
5. The Dial-Up / Leased-Line Modem (DLM).
The following instructions assume you are familiar with your terminal emulator program and
how to connect the DLM to your computer. See the Hardware Installation section for
instructions on connecting the DLM to your computer.
The DLM uses “AT” commands like many internal and external modems used with
computers. Like other modems some of the AT commands are standard while others are
specific to the manufacture.
All commands except the command to enter the command mode must be prefixed by “AT”.
The following sections describe the commands you are most likely need to modify. A
complete list is available from AGM Electronics Inc.
Entering Command Mode
When used with Dial-Up connections the escape character sequence of “+++” will switch
form the data mode to the command mode.
When used with Leased-Lines, the DLM has a 10 second window after power up during
which the DLM will always respond to commands. There is also a 30 second delay between
power up and when the DLM enters Leased-Line mode. Use the “%DC0” to allow
commands beyond the first 10 seconds and “&L0” command to disable the Leased-Line
mode.
NOTE:
We recommend always restoring the DLM to factory defaults and reentering all
settings in the Getting Started Section. This guarantees the DLM is in a known
condition. The commands in this section are to provide a better understanding of
the commands used for setting up the DLM and to provide information for
advanced modem uses in setting up custom configurations.
