VT920 / GSM modem (legacy)

Connection diagram

All monitoring units, VT8101, VT8101T, VT8110, VT800, VT808, and VT1908 have the possibility to install a GSM modem. The device is mounted and connected to the master unit. Needed when the network is absent or for reservation of a connection channel of the master unit with the Internet; for sending SMS notifications and SMS commands.

Supply includes

№	Component	Description

№	Component	Description
1	Unknown Attachment	Modem board
2	Unknown Attachment	Antenna
3	Unknown Attachment	Antenna wire
4	Unknown Attachment	BH16 cable
5	Unknown Attachment	M3*5mm bolts. 3pcs

Installation of GSM modem

To install and to connect extension units: switch off appliance, unplug from the outlet or disconnect the power connector.

1		Carefully unscrew three screws holding the cover and open it. Antenna, GSM or Dry Contacts module are installed inside. Carefully open the box by unplugging, if necessary, any cables that connect from top cover to bottom cover.
2		Connect antenna cable to the modem board. Carefully connect the U-Fl antenna cable to the input U-FL connector and gently press it. If possible install the connector on the seat with a magnifying glass!
3		Set up the GSM modem card on 3 steel spacing sleeves on the cover, attach card to the sleeves using three M3 screws supplied with the modem.
4		Set the SMA connector antenna cable to the rear or to the front panel of the appliance into the corresponding SMA hole. Put on the SMA connector gold-plated washer and nut from the supply, holding SMA connector with one key, securely tighten the nut with the other key. Do not tighten SMA connector with one key, you can break the cable and the connection would be lost!
5		Connect 16-pin flat cable to the connectors on the modem card and on the appliance motherboard. Close and fasten the cover. If necessary, install the SIM card into the appropriate hole.
6		Carefully place top cover back so that all cover wings fit in and all cutoffpoints match the panel holes. Then use 3 screws to close the enclosure. When installing the green dry contact connectors can go tight, check the burrs and remove them with rasp!