JVA SMS Gateway User Manual
4
Antenna
A GSM antenna is supplied and must be connected to the unit for it to communicate on the mobile
network. If mobile reception in the area is particularly weak, the antenna can be substituted for a
more powerful one provided it has a compatible SMA connector.
Ensure the antenna is mounted away from any high voltage cables or AC power cables which could
cause interference. If the unit is mounted inside a metal enclosure, the antenna should be mounted
externally and the cable entry hole be sealed against water ingress.
Power and Keypad Bus
The keypad bus enables digital communication between the SMS Gateway and connected devices.
Connect the DATA and GND terminals to the respective terminals of all connected devices.
The SMS Gateway requires 12V dc to operate. This power may be supplied from the keypad bus of a
connected energiser, or for best results a separate 12V 1A power supply may be used. Do not
connect the unit to a separate power supply
and
keypad bus +12V of an energiser at the same time.
The SMS Gateway operates as a keypad with keypad ID 6. Keypad ID 3 is reserved. If other keypads
or keypad devices are to be used with the group, they should be set to a keypad ID other than 3 or 6.
SIM card
The unit does not use data or voice calls, only SMS. A suitable pre-paid or post-paid plan should be
chosen that offers cheap or unlimited SMS messages for sites requiring frequent status updates, or
long credit expiry time for sites requiring infrequent updates.
