Modem Control/Dial-up Connections
FP Modem-EU Technical Manual
3.4.2 Terminating a Connection
The data connection is maintained until the modem:
• has received the command to hang up (+++ ATH<CR>) from the controller and
responds with NO CARRIER
• cannot detect the carrier anymore (reason: interference too severe, carrier is no longer
active) and is responding with NO CARRIER
• has received a termination sequence from the remote modem and responds with NO
CARRIER
• If the connection is not terminated properly after data transmission, the
telephone meter may keep on running!
• As soon as the data connection is terminated, the DCD LED is switched off
and the DCD output switches back to the inactive state.
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