Fire-Lite MS-9050UDC Addressable Fire Alarm Control Panel - Manual (Page 152)

152 MS-9050 Series Manual — P/N 52413:G 4/14/2014
Local/Remote Site Upload/Download Security Features
Time-out at Control Panel
Upon answering an incoming (modem) call on the primary Central Station phone line, the control
panel will listen for a modem connection signal. If this signal is not received within 30 seconds, the
control panel will disconnect the call. Upon successful connection (secret code verified), if no
communication occurs within five minutes, the panel will disconnect the call.
Whether a PC is connected locally (at the job-site) or remotely (modem), 2 minutes of inactivity
will result in an upload/download time-out. Upon time-out, transfer activity will be reported to the
Central Station (if enabled) and the connection will be terminated.
Error Checking
As each block of data is received by the control panel, it is checked for accuracy. If an error is
detected, the block is retransmitted until correct, up to a maximum of four times. If the Secret Code
is not verified and four errors occur, the call is disconnected and the report that the upload/down-
load was not successful is called to the Central Station(s).
Central Station Data Protection
The primary and secondary Central Station phone numbers, communications format, account code,
test time and programmable event codes are vital Central Station information. These blocks of data
are protected from partial programming due to faulty phone connections, line noise and other
errors. This prevents the panel from being confused due to a wrong phone number, account code,
test time and most critical formatting errors.