ADS Environmental Services Model 4000 530017 A0 - Manual (Page 96)

5-10 ADS Model 4000 Manual
Problem Busy signal occurs when calling the monitor.
Possible
Causes
Someone else may be communicating with monitor.
Telephone cable may be damaged.
Lightning protection module may be damaged.
Telephone cable may have shorted.
Lightning protection board in monitor may be damaged.
Modem in monitor may be damaged.
Possible
Solutions
Wait a few minutes, and attempt to communicate with
monitor again.
Connect at the site using the DMI cable, and try to
communicate with monitor.
Use voltmeter to check voltage on telephone cable.
Voltage should be approximately 48 Vdc on hook. If it is
not, disconnect phone line at the lightning protection
module and check the voltage at the network interface
box.
Make sure telephone cable is not damaged or severed,
and repair or replace cable if necessary.
Check telephone connector for moisture.