Perle Systems NOVACOM Wireless Modem GNS-30CR - Manual (Page 17)

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8. Startup
Before startup, the components required for your application must be
connected. The SIM card must be inserted into SIM card holder.
The Modem is ready for operation when supply voltage is applied and the
ignition line is activated. If the recommended plug-in power supply unit is used,
the ignition line is already connected to the supply voltage line, and the Modem is
thus immediately switched to the active state. It starts the network search and
registers with network operator.