User Manual

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Operation

RFI-9256 Radio Modem User Manual Page 34 of 96

The most common use for this co-existence is to allow remote monitoring of radios without disrupting the

main data path through the network. This is achieved by configuring the main data path on the main port,

and leaving the auxiliary port on the master unit for Hayes dial-up. Hayes commands can then be used to

connect to the terminal menu of each individual radio in the network.

4.3.6 Network Link and Online Determination

There are two important indications given by the RFI-9256 as to the current network status, network link and

online. These two parameters have different functionality when running in point-to-point, point-to-

multipoint broadcast, Hayes dial-up, and SCADA routing modes as shown in Table 11.

Mode Network Link on Master Online (both Master and Slave)

Point-to-

point

Comes on whenever a point-to-point

connection is established with a

slave, and is turned off when the

point-to-point connection is closed.

In turning off it waits for 3 * network

link timeout ms.

While there is no point-to-point link established, the

LED is off. Once the point-to-point link is

established the LED is set on (green).

If connection is severed, both units will flash the

Online light red every time a packet is dropped due

to running out of retries. This will happen once per

online request poll (defaults to 3 seconds). Once the

network link light is turned red, the online light will

be turned off.

Point-to-

multipoint

Broadcast

Turns green whenever data is

received. Turns off again after no

data has been received for 3 *

network link timeout ms.

Turns green whenever data is received. Turns off

after a short period with no data.

Hayes

Dial-up

Comes on whenever a dial-up

connection is established with the

slave, is turned off when the dial-up

connection is closed. In turning off it

waits for 3 * network link timeout

ms.

While there is no dial-up connection, the LED is off.

Once the dial-up connection is established, the LED

is set on (green).

If connection is severed, the dialler (source of the

connection) will flash the Online light red every

time a packet is dropped due to running out of

retries. This will happen (in the absence of data)

once per online request poll. Once the network link

LED is turned red, the online light will turn black.

The receiver (destination) will turn its online light

off immediately upon losing the first online request

from the dialler.

SCADA

protocol

networks