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When making a call, after the data connection is establi-
shed, the “
NN
PWD . . .” command (where “
NN
” is the ad-
dress of the device controlling the modem, i .e . the one with
O .31 set to “On”) must be issued by the remote computer
within 15 seconds . When the data connection is up, the
RS485 protocol for a remote connection is all the same as
for a local network (see the previous section) . An automatic
disconnection takes place if no character is received in the
RS485 network in 3-4 minutes .
When a modem connection is up, the cellular module does
not send any SMS . If an error for which the SMS sending is
enabled is active after closing the modem connection, an
alarm SMS will be sent by the HI504 after disconnection .
