SATELLINE-EASy / SATELLINE-EASy 869
User Guide, Version 3.0
29
5.7
Separate RX/TX-frequencies
SATELLINE-EASy can transmit (TX-frequency) and receive (RX-frequency) on separate
frequencies. The switch between the frequencies introduces an extra 40 ms delay in the data
transfer that must be taken account when designing the system.
5.8
Free Channel Scan (FCS)
NOTE! Free Channel Scan (FCS) is not applicable to SATELLINE-EASy 869 modems.
Free Channel Scan (FCS) is designed for one-way transmission between one transmitter and one
or more receivers when there are at least two different radio frequencies available. The
transmitter monitors the noise level of the channels between the transmissions and finds the best
transmission channel. The receivers scan and follow the frequency of that particular transmitter
consequently. A more detailed description of FCS function and FCS terminal software is
available from the manufacturer or from the nearest distributor.
5.9
User data whitening
In some cases, if the user data includes a large number of constant characters, additional bit
errors may appear. The use of error correction (FEC) is recommended in such cases. If that is
not possible, the Data whitening feature can be used to improve the reliability of data transfer.
The feature is set on/off in the programming mode
.
NOTE!
All radio modems, which are to communicate with each other, must have the same
setting for Data whitening (ON or OFF). If the transmitting radio modem and the receiving
radio modem has different settings, data will not be received correctly.
