The System Sentry has four LED's which indicate various aspects of system operation. These LED's indicate what basic operations and status are currently active as described below:

When power is first applied, the System Sentry performs the following steps:

• The Status LED is turned on, the Charge & Phone LED's are turned off, and the Fault LED will start blinking rapidly.
• The Modem Power is turned on (if it was off) and the system delays for 1.5 seconds.
• The ATR Power is turned on (if it was off) and the system waits another 1.5 seconds.
• The phone line is checked to make sure it is ON HOOK. If it is not, then a FAULT condition is set.

• The Status LED is turned ON.
• The Phone LED will blink quickly for about 1.5 seconds when a Ring is detected, blink slowly if the modem picks up the phone, or turn on solid when the modem reports DCD signal.
• The Phone LED turns off again when the modem hangs up.
• The Fault LED will be ON if a FAULT condition occurs. When this LED is on, you are not advised to leave the site since the System Sentry believes there is some problem with the connections.
• The Charge LED will be ON if more than about 50mA is being provided by the Solar/DC input.

• The Status LED will blink once every 5 seconds.
• The Phone LED behaves the same as in the Operating Mode. If the modem reports a DCD signal, then the System Sentry exits the Run Mode and returns to the Operating Mode (see #2 above).
• The Fault LED will blink at the same time the Status LED does if a FAULT condition is present.
• The Charge LED will be ON if more than about 50mA is being provided by the Solar/DC input.

• The Status LED will blink rapidly.
• The Phone LED behaves the same as in the Operating Mode. If the System Sentry was accessed remotely and loses connection, then it returns to the Operating Mode.
• If the System Sentry was accessed locally through the Counter/Computer port, and then a connection is made, the System Sentry will disconnect the local user and connect to the remote caller.
• The Fault LED behaves the same as in the Operating Mode.
• The Charge LED will be ON if more than about 50mA is being provided by the Solar/DC input.

• The Phone and Fault LED's will blink back and forth quickly while the Status light is on.

• The Status & Fault LED's will blink back and forth. The Phone LED will be on if carrier is detected from the modem port.

At All Times:

• If RTS is not active from Counter/Computer.
• If Modem is on and CTS and DSR are not active, then a fault condition exists UNLESS the modem has powered itself off (like the Cascade Modem).

Only When Modem Mode Set To "Land Line":

• After the initial power up the phone line is not "On Hook". This usually indicates the phone line wasn't connected, line is in use, modem is not working, there is a problem with the line itself, or this is a Cell site.

1. Make sure everything is connected properly.
2. Try disconnecting just the modem. If this fixes the problem then your modem may be bad.
3. Connect the line to a handset to make sure you can hear dialtone.
4. If this is a cell site, reprogram the System Sentry (either at the site with a laptop or remotely) to operate in "Cellular" mode instead of "Land Line" mode.

• Any time DCD (Carrier Detect) is active when the modem is "On Hook". This indicates an incorrect modem programming, or a possibly bad modem/cable.

1. The modem needs to have &D1 sent to it and stored as part of its initialization.
2. Replace modem and/or cable to try and solve the problem