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16 1892 1335 - Orion Radio Modem Operating Instructions - v1.3 / Aug 2006
TOR
TOT
Single outstation. The master is configured as TOR, and the outstation as TOT.
Data input at the outstation is output at the master’s normal data port, I/O
???and alarm messages are output on the secondary data port. External
equipment (the GUI for example) is needed at the master to supervise the
operation and receive data.
TOX
TOT
The master is configured as TOX, and each outstation as TOT, with an ID
number so that it can be individually addressed. When it is polled by the
master, data input at the outstation is output at the master’s normal data port,
and I/O data and alarm messages are output on the secondary data port. The
secondary data port operates at a fixed data rate of 19200 baud. External
equipment (the GUI for example) is needed at the master to supervise the
operation and receive data.
Modem Parameter Configuration
Figure 14 - Modem Parameters tab
Transmitter key-up time
This time is allowed to elapse before any data is sent, to ensure that the radio is ready.
The value depends on the particular radio fitted.
Squelch to start of preamble
During receive, the modem allows this period to elapse after the squelch has operated
before reporting a missing preamble.
No of preamble blocks
The number of preamble blocks which will be sent after the key-up time. Too few will not
allow the remote receiver to establish sync, too many will waste transmission time. 9 is a
typical value.