SATELLINE-EASy Pro 35W
User Guide v.1.4
38
8.3.3
TX delay
The radio modem can be configured to delay the beginning of a radio transmission by
1...65000ms. This function can be used to prevent packet contention in a system, where all
substations would otherwise answer a poll of a base-station simultaneously. During this delay data
sent to the radio modem is buffered. Although the priority setting is "RX", radio modem is
prevented to change over to receiving mode during the period of the TX delay. If this function is
not needed, the delay time should be set to 0 ms.
8.4
Testing
The radio modem can be switched to the
Test Mode
, where it will send a test packet on the radio
channel. The test packet is a normal data transmission, which can be used, for example, when
directing antennas during system installation.
When the test packet transmission has been switched on and saved by using the
Programming
Mode
, the transmitting radio modem needs only a power supply and an antenna.
If the channel spacing of the radio modems is 25 kHz, it is recommended to use 38400 bps as a
serial data speed of the receiving radio modem. In the case of 12.5 / 20 kHz channel spacing the
data speed of 19200 bps is recommended.
There are two
Test Modes:
Short data block test
In this test mode the radio modem sends a short test string, which is preceded by a consecutive
number, and it ends to the line feed character. The short data block is repeated continuously after
1 s break.
Short data block test is suitable for running data communication tests. Error-free reception of data
can be monitored using a suitable terminal program.
Example of a short data blocks:
00 This is a testline of SATELLINE-3AS radio modem
Long data block test
Long data block consists of character strings, which are repeated without breaks 50 s time period.
After 10 s break the test transmission is started again.
Long block data test can be used for measuring Tx output power, standing wave ratio (SWR) of
the antenna system or received signal strength at Rx stations. Using Long Block Test requires
running the modem in radio compatibility mode SATELLINE-3AS.
Example of a long data blocks:
00 This is a long testline of SATELLINE-3AS radio modem
