Weidmuller GPRS Alarm Unit - Manual (Page 27)

Description of Functions
3-25
3.4.3 The "Passive" mode
The "Passive" mode provides a data connection from a remote PC, via
a modem and the IE-GPRS-I/O to a device connected to the serial
interface of your IE-GPRS-I/O.
Procedure
• The PC calls the IE-GPRS-I/O via a modem.
• The IE-GPRS-I/O accepts the call and establishes a connection.
• On the basis of the first data sent by the PC, the IE-GPRS-I/O
decides whether the data are part of a remote configuration for the
IE-GPRS-I/O or whether the data are intended for a downstream
device.
• If the data are intended for a downstream device, they are passed
to the serial interface. All data sent by the downstream device to
the serial interface are sent without changes to the remote
computer via the modem connection.
3.4.4 The "Transparent" mode
In the "Transparent" mode, it is possible for the internal GSM/GPRS
modem to be controlled by a downstream device.
• In this case, the establishing, cancellation and monitoring of the
connection must be controlled by the downstream device.