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Users Manual & Installation Guide
PV- 1800: Power supply module with GSM MODEM
Page 7 / 21
Power Supply
The on-board power supply consists of a synchronous step-down switching regulator with an
efficiency of 85-95%, depending on input voltage and load current. At nominal input voltage (24V
DC) and a load current of 2A the efficiency is 92%. A green status LED, placed on the rear side of
the PCB, is on when the +5V is present.
The connector for the power input is a 2 pole pin header from Molex. The mating part for this
connector is Molex 10-17-3020 with 2 crimp terminals – Molex 2478.
Modem
The modem unit used in the PV-18xx module is a Sony Ericsson GM47 which is a GSM dual band
product for 900/1800 MHz. The unit is placed in a 60pin socket and secured by two M2 screws and
nuts.
Modem status LED
A yellow status LED is connected to the modem. This LED is placed on the rear side of the PCB.
The LED has this function:
Setting up the module
All communication between the modem and the CPU is done through an on-board 16C550
compatible UART. The COM port and the IRQ used for the modem are set by two jumper blocks.
The address is set by one to three jumpers in positions 1 to 3 in section COM_A.
The table shows how different COM ports can be configured.
Modem LED
Status
Off Modem off
On, steady Power on, not connected to network
On, flashing Power on, connected to network
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