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SATEL OY
// SATELLAR MANUAL // RADIO UNIT // USER GUIDE // V. 1.8
6. Data transmission
3
RSSI
threshold
Goes to the inactive state only when the received signal is stronger
than the pre-defined threshold value.
Always on
The line is always in the active state.
Table 6.1
CTS line in inactive state
6.6.2.2 RTS (Request To Send)
The RTS line is normally in the active state, which means that the DTE is ready to accept data from the RU.
When the DTE sets the line to the inactive state the data transfer from the RU to the DTE is not possible.
There are three alternatives for the user to select how the RU reacts when the RTS line goes to the inactive
state. These are explained in the table below:
Selection
Description
Flow control
The RU continues the reception but buffers the received data
until the RTS line goes back to the active state. This is typically
used in situations where the DTE is too slow to receive all the
data. The size of the receiver buffer is about 1.6 kBytes but
must be checked for each particular HW and SW version if
seen critical in the application.
Reception control
The RU stops the whole reception.
Ignore
The status of the RTS line is not followed at all.
Table 6.2
RTS line in inactive state
6.6.2.3 CD (Carrier Detect)
The CD line is an indicator from the RU to the DTE that a signal has been detected on the radio channel.
There are three alternative criteria for the user to select when the line goes to the active state. These are
explained in the table below:
Selection
Description
RSSI Threshold
Active when the received signal is stronger than the pre-
defined threshold value.
Data on channel
Active when there is a data reception ongoing.
Always on
The line is always in the active state.
Table 6.3
CD line in inactive state
It depends on the application how the DTE reacts to the information provided by the CD line.