15
11.
MicroFit 4 power connector;
12.
hard reset and signal strength detection button.
2.10. Interfaces
The device is equipped with two serial interfaces: Mini USB and RS232 as well as the GPIO programmable
interface.
2.10.1. Mini USB Connector
The mini USB interface is used to set up the modem and log its operation (log removal). For operation of the
modem via Mini USB, it is required to install the USB driver which can be downloaded from the official website
of the Radiofid System Company (
) in "Support" section). The computer determines the modem
as a virtual COM port. The modem is powered via Mini USB interface only for operation in the service mode.
Fig. 2.4
Mini USB Connector
Note 1
USB is used in the "device" mode, therefore it can be used only for connection to a computer or
other host controller.
Note 2
With a terminal program, for example, Hyper Terminal, close a COM port in this program before
you connect a USB cable. You can open a COM port after connecting a USB cable.
2.10.2. DB9 Connector (RS232)
The connector is used to connect the modem to an external device with the RS232 interface (COM port).
Port factory settings: baud rate
– 9600, data bits – 8, parity – not used, stop bits – 1. All the parameters of the
operating COM port are changed in the service mode.
