Configuration
RFI-9256 Radio Modem User Manual
Page 18 of 109
transmitting network synchronization messages. Master radios will only show network link when connected
to a slave in point-to-point, Hayes dial-up mode, or when receiving user data.
In a radio network with a strong signal (better than -90dBm), network link should be predominately green, it
may go red from time to time, but should not go off. A red network link indicator means that the radio has
temporarily lost the remote unit. This should occur infrequently.
CARRIER DETECT
When carrier detect is green in mode 1 it shows that the unit can hear a remote radio. Slave radios in a
network should always show carrier detect, as a master radio is constantly transmitting a synchronization
signal. Master radios however will only show this LED when connected to a slave in point-to-point or Hayes
dial-up mode, or when receiving data from a slave unit. Generally it can be assumed that if a slave can hear
its master then the master can also hear its slave.
In a good radio network carrier detect should be predominately green with flashes of red. A flash of red
indicated that one RF packet has been lost. It is acceptable, and expected, that some RF packets will be lost
as the RFI-9256 operates in an industrial, scientific, and military band (ISM) where there is a potential for
interference from other radios. A red flash of carrier detect does not mean user data has been discarded, as
the RFI-9256 will retry any packet that is lost or corrupted during transmission.
TRANSMIT DATA
The transmit data LED indicates that data has been received from a remote radio and transmitted out of
either the main or auxiliary serial port. The colour of the LED does not matter. If the LED is lighting up, but
the connected device is not receiving data it could indicate a damaged/broken serial cable, latency issues
with the protocol of the device, or incorrect serial port configuration.
The transmit data LED will also flash when local Hayes commands are issued or the terminal menu is being
used.
RECEIVE DATA
The receive data LED indicates that data has been received from the connected device on either the main or
auxiliary serial port and sent through to the remote radio. The colour of the LED does not matter. If the
remote radio is not receiving the RF data, given there is a sufficient RF path (as indicated by the carrier
detect and network link LEDs), there may be a problem with the radio addressing or protocol routing in the
radio set-up.
The receive data LED will also flash when local Hayes commands are issued or the terminal menu is being
used.
ONLINE
When the online LED is green it shows that a packet has been received from a remote unit. The Online LED
will remain green while two units are connected in point-to-point mode or Hayes dialup mode. It is not
