Specifications

2. Description

2.1. Compatibility

Firmware version 2.1.x.x is not compatible with older versions 2.0.x.x. Older fw needs to be upgraded

with the new version 2.1.x.x, see Section 2.7, “Firmware upgrade”.

2.2. Operation modes

There are 3 possible operation modes:

• Main mode – mode of a standard operation

• Service mode – mode for firmware download

• Bootloader mode – mode for downloading bootloader

2.2.1. Main mode

Main mode is a standard operating mode where the radio modem works as a transparent bridge on

the Ethernet interface or as a transparent link (bus) on the serial interface. Main mode is operated after

approx. 20 sec. from switching on the supply voltage. The deblock mechanism can be activated after

a short-time break and can stretch this time. Main mode is indicated by LED STATUS – green colour

2 sec. ON and 1 sec. OFF.

Default state

When button RST is pressed for 10 sec. during Main mode, the STATUS LED changes its colour to

yellow and the parameters are set to default values. After the next 15 sec. default values are saved

and the radio modem goes back to Main mode working with default values and IP address 192.168.1.2

hereafter.

Generally

Frames are transmitted to the opposite side of the radio network to an application through the same

interface (RS232 or Ethernet) as they have been received.

Communication over serial interface

The data received through SCC is loaded into buffer of depth 5 packets and subsequently sent to RFC.

A packet received through RS232 is closed when its size achieves a value set in the MTU parameter,

or after a pause, which is equal to the parameter Idle. Afterwards it is immediately transmitted to the

RF channel (neither CDMA nor TDMA RF channel access). All radio modems which receive this

packet transmit it to their serial interface. The network works like an RS232 bus, i.e. every one hears

each other, so it is suitable for “poll” type applications, when the master station polls requests to slave

stations one by one. It is possible to connect more slaves behind one radio modem using an external

RS485 converter.

Description