FAQ Gamme ARM EN

Can these equipment work in a hostile industrial environment?

Yes.

Spread spectrum technology was originally developed for military purposes and is very robust against interference.

We have carried out numerous industrial installations in highly disturbed environments: XI1510 wireless access points next to steel furnaces, overhead cranes, on-board systems, trucks, etc.

Is operation guaranteed if the 2 remote radio modems are at different temperatures?

Yes.

This is a point often neglected on many radio equipments: Since the new ABR6 version of the radio card (in 868MHz), we have put a TCXO (Temperature Compensated Quartz Oscillator), which allows to maintain an excellent frequency stability whatever the temperature.

We have applications on ovens for example where one of the radios is at more than 60°C while the other is at room temperature, it is the same configuration on racing motorcycles where the onboard radio modem is at more than 70°C between the exhaust pipes.

Previously without this TCXO, we lost data above 200km/h the Doplet effect making the frequency drift worse, now with the new version the operation remains correct even at high speed.

When I power the ARM-SE the 2 leds of the RJ45 remain lit and I have no connection, what to do ?

This indicates that the equipment connected to the ARM-SE is not at the right speed, in fact the ARM-SE supports a rate of 10Mbps max and this happens if it receives frames at 100Mbps for example.

In this case, you just have to set the speed of your equipment to 10Mbps or automatic. On a PC, you have to set the speed of the network card to AUTO.

Wireless UNITELWAY communication

The Unitelway protocol used on serial links allows communication between a master device and one or more slaves.

The dialogue is always initiated by the master and no slave can decide to speak without the master having given it to him.

The master thus cyclically interrogates each slave in order to assign them a speaking time.

If the slave does not respond to this type of request, the master passes the floor to the next slave after a timeout.

In the case where the communication takes place via a radio link by ARM, it is imperative to increase the timeout set on the master side because of the transmission delays of the radio modems.

As a safety measure, it is advisable to set this parameter to 100ms.

I can't access the modem or make a wireless connection.

Setup on Windows Vista

Control Panel > Network and Sharing Center > Local Area Connection > Properties > General tab > Internet Protocol (TCP/IP) > Properties > IP address.

If you still cannot access it, check that no firewall ( Control Panel > Firewall ) is blocking the communication and make sure that it is not redirected to another network card (Wifi card for example, which can be deactivated ( Control Panel > Wireless Network Connection ).

What to do in the case of a communication between two networks of different IP classes?

Basically, to access the modem’s configuration via web pages or to use its radio channel, the machine that connects to it must be configured in the same IP address class.

In the case of a link between two networks of different class, it will be necessary to modify the modem’s subnet mask (the modem does not act as a router).

This also has the advantage of filtering a category of IP addresses and not overloading the radio channel, or defining a coverage area associated with a specific class of addresses.

To achieve complete transparency between different or unknown network classes (e.g. Internet) it is possible to set the subnet mask to 0.0.0.0.