Specifications
ELAN AUDIO - SENTINEL / RCU-01 RCU01R02 PAGE 9/49
4.7 Configure a modem for use with the RCU (If PSTN or mobile mode)
If you have purchased the modem from ELAN Audio, it should be already configured. If you are not sure, then
power the modem up and if the 'AA' (Auto Answer) LED is on, then that would indicate it has been configured.
To use a modem in the SENTINEL /RCU system it is essential that the following parameters / functions MUST be
available and configured on both the host and the remote modem. The configuration requirements are the same
for ALL modems.
1. The serial port data rate MUST be fixed to 9600.
2. The modem MUST hang up when DTR is dropped.
3. The modem DCD MUST track the line carrier.
4. The modem MUST be able to auto answer.
Most modems have the ability to configure 2, 3 & 4. Only some modems can configure 1.
Auto baud rate detection on the serial port is useless for an auto answer modem as the serial port data rate will
track whatever the line connection speed is unless there has been serial communications via the serial port
before the line connection. At the RCU it is impossible to ensure that the RCU communicates with the modem
before a connection might occur. Periodic communication could abort an incoming call and / or the modem could
be reset / replaced without the RCU knowing.
In windows, use ‘HyperTerm’ set up for direct access to the appropriate com port. 9600,8N,1
• Exit SENTINEL if running.
• Connect the modem to a serial port on the computer and apply power.
• Click on START
• Click on PROGRAMS
• Click on ACCESSORIES
• Click on HYPERTERM
• Double click on the HYPERTRM icon
• Answer NO to request to install modem now, if asked.
• Enter a name, like SENTINEL for example,
• Select a suitable icon from the icon menu.
• Select the port the modem is connected to. The 9 pin connector is generally COM1.
• Set the properties for the selected com port
Bits per second 9600, Data bits 8, Parity none, Stop bits 1, Flow control Hardware and OK
You will now be in the terminal screen. The icon you chose earlier will now be available for future use in the
HyperTerminal Window, and possibly from the DOCUMENTS choice in START.
For ‘MAESTRO WOOMERA’ (or other V90 type modem), send the following to the modem
Command Comment
at&f Reset modem
ats0=2&c1&d2e0m1&w0 Auto answer after 2 rings, DCD tracks line carrier, No echo,
DTR hang up, Speaker on until connected, Save config
at+ms=11,,,,,, Force connection speed ( NB There are six commas )
at&w0 Save configuration
An OK response should appear after each command. If no response appears, check port selected.
For ‘BANKSIA PRO34’ (or other V32 type modem), send the following to the modem
Command Comment
at&f Reset modem
ats0=2&b1&c1&d2e0m1&w0 Auto answer after 2 rings, DCD tracks line carrier, No echo,
DTR hang up, Speaker on until connected, Save config
NOTE: If you get an error response from the modem, then it is not suitable to be used at the RCU end.
Some modems will reject the &b1, fixed serial port data rate, command. This can be omitted for the host modem. It is
essential for the RCU modem. The MAESTRO Woomera modem automatically supports fixed serial port data rate and
therefore doesn’t require and doesn't support the &b1 command.