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GenComm Page 3 - Generating Set Status Information
1. A unique manufacturer code is assigned to each manufacturer.
2. The meaning of the model number is manufacturer specific, e.g. two manufacturers may have
a model 100.
3. The manufacturer code and model number must be used together to identify a particular
product unambiguously.
4. The meaning of the control mode is shown in the table below.
5. The shutdown flag on a control unit indicates that one or more of the alarm codes has been set
to ‘shutdown alarm’, it will clear automatically when no alarm codes are set to shutdown alarm.
A system control function is used to clear shutdown alarms. In some situations it may not be
possible to set one of the alarm codes to indicate the type of shutdown alarm because the type
is not known, in this case only the shutdown flag will be set and the master should consider it
an undefined shutdown alarm.
6. The shutdown alarm flag on a hub indicate that state of the hub itself, not the state of any
satellite. The state of a satellite must be read from the satellite itself.
7. The electrical trip and warning alarm flags operate in the same way as the shutdown alarm flag
but for the corresponding alarm codes.
8. The telemetry alarm flag on a control unit is set when the control unit decides that a dial-out is
required, the logic behind this is product specific. It can only be cleared by a system control
function.
9. The telemetry alarm flag on a hub is only set if the hub itself has a problem, and can only be
cleared by a system control function. It is edge triggered i.e. once it is cleared it will not be set
unless the internal error is cleared and then happens again. An example of a situation that will
set this flag is if the hub loses communication with a satellite.
10. The satellite telemetry alarm flag is the OR of all the satellite telemetry alarm flags in the
‘telemetry status and configuration’ page and indicates that one or more satellites requires
servicing.
11. Whenever the telemetry alarm flag (or one of the satellite telemetry alarm flags in the case of a
hub) is set it will cause continual dial outs if a modem is fitted and dial out is enabled.
12. The meaning of the state machine status is described in the table below.
13. The string checksum is the sum of every character in every fixed string in the slave device, it is
used to detect the substitution of a slave device that differs only in its strings and thus check
the validity of any copies of these strings held by a master. This number must not change
during the normal operation of the slave device. The exact method of calculating the checksum
must not be assumed and it must not be compared with a checksum generated by a master, it
must only be compared with a previously read checksum to determine change.
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