Operating instructions

1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 21
Unit ID (ATS170) The Base unit is defined by having UnitID set to 0, and is responsible
for polling if applicable.
For one-to-one configurations, set the single Outstation to UnitID = 1.
Although Outstations in a one-to-all configuration are always
addressed together using a broadcast code, they should be given
separate Unit IDs from 1 up to 254 so that they can be separately
addressed for maintenance or distinguished for User Data purposes.
See the section on Addressing on page 14.
Dest ID
(Destination for
messages which
the unit initiates)
(ATS171)
For one-to-one configurations, set the Base to DestID = 1 and the
single Outstation to DestID = 0 to correspond with the UnitIDs.
For one-to-all configurations, set the Base unit to DestID = 255
(broadcast), and the Outstations can be left at any value since they
never transmit. (If independent User Data is transmitted, DestID
should be the intended recipient’s UnitID).
Group ID (ATS169) Any number between 1 and 254, all units the same within the Group.
Poll Timer time
(ATS183)
If set to zero on both of two units, information will be passed when a
change occurs (spontaneous operation). If the time is set to greater
than zero, the Base will poll the Outstation with the set period and the
Outstation will check for a poll during the set period plus 3s: they
should therefore always be made the same. Poll period can be from
100ms up to 182 hours (just over a week).
Permit initiation of
transmissions
(ATS330)
All alarm and spontaneous report messages can be suppressed by
turning this setting to off. This must be done for the one-to-all
configuration. The alert still functions if selected. However, replies
and acknowledgements in response to a message from another unit
may still be made. User Data transmissions are unaffected.
Master Failsafe
control (ATS188)
If a Comms Alarm is raised (communications are lost or the power
supply goes outside limits), telemetry outputs are made to take on
values you specify. If this setting is turned to off, this no longer
happens and outputs remain as they are.
No. of missing
messages before
Comms Alarm
(ATS184)
If acknowledgement is not received by the Base after this number of
polls or spontaneous/alarm transmissions to the Outstation, a
Comms Alarm is raised. If an Outstation does not hear a poll for this
number of poll periods (plus 3s for each period), or receives no
acknowledgement to this number of spontaneous or alarm
transmissions, a Comms Alarm is raised. The Poll Timer (ATS183)
sets the poll period.
Number of
transmission
attempts
(ATS185)
If acknowledgement is not received when expected after a
transmission, repeat attempts are made until an acknowledgement is
received or a total of this number of transmissions have been made.