Fragmentation
It is possible to set a threshold on the radio channel from which transmitted packets begin to fragment.
The receiving modem transmits a packet to the interface only when all fragments are received success-
fully. This also applies in a Repeater for transmission of a packet to the RF channel.
From fw 2.1.3.0 the fragmented packets are processed in Repeater in the different way. This caused
the acceleration of communication but simultaneously the incompatibility with the older versions 2.0.x.x.
These older firmware is to be replace by the version 2.1.3.0 or some of the serie 2.1.x.x, see Section 2.7,
“Firmware upgrade”.
Remote access
In the case of good conditions for communication on RFC remote access to radio modem RE is an
available option. Insert the IP address of the remote modem RE into the www browser attached by
Ethernet cable to the RE modem. Leave cursor in the address line and press Enter. We can read and
save configurations in the remote modem. Typical reaction time is 20 to 40 sec.
This function is not generally guaranteed because the http protocol is not optimised for work in slow
networks. In the case of a slow response from the radio channel the TCP protocol adaptively extends
timeout up to tens of seconds. In addition a PC running Windows generally has other protocols installed
on the ETH channel which load or worsen communication conditions.
2.2.2. Service mode, Bootloader mode
These modes are used for firmware upgrades (Section 2.7, “Firmware upgrade”): Service mode for
firmware downloads, Bootloader mode for bootloader downloads.
Switching to Service mode: approx. 2 sec. after switching on power press the RST button for a few
seconds. Service mode is indicated by the yellow STATUS LED flashing every 1+1 sec.
Switching to Bootloader mode: keep RST button pressed while switching on the power for approx. 3
sec. Bootloader mode is indicated by quick flashing of the yellow STATUS LED.
Both Service mode as well as Bootloader mode use 192.168.1.1. IP address.
Narrowband radio modem ECONOMY RE400 – © RACOM s.r.o.
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Description
