Owner's manual

Table Of Contents
Equipment-to-Host Messages 3-21
3.4.7 Limits Monitoring
The Host can define limits for various Variables on the Equipment. When the appropriate limits
transitions occur, the Equipment will report this occurrence by sending an event to the Host (if the event
is enabled). The Host may define limits for a particular Variable through the S2F45 (Define Variable
Limit Attributes). Through this message, the Host may define up to seven limits for each eligible
Variable. For each limit (LIMITID), the Host defines an UPPERDB and a LOWERDB. The Equipment
generates events when a transition across these boundaries occurs. The Host may set the rate at which the
Equipment polls the Variables to determine if a limit has been crossed by setting the
GEMLIMITSDELAY variable (VID 60).
3.4.7.1 Event Signaling
For any event that exists on the Equipment, the event message will be sent to the Host only if the
reporting for that particular event has been enabled. In this “EVENT SIGNALING” section, assume that
the Host has enabled the proper reporting so that these events will be sent to the Host.
After the Host sets UPPERDB and LOWERDB values for a particular limit, the Equipment will send an
event message when a transition occurs across these boundaries. The procedure for reporting is illustrated
in Figure 3-5 and Figure 3-6.
Figure 3-5 Limits Events Signaling
Limit Transition
Event
Limit Transition
Event
Limit Transition
Event
Upper
Deadband
Lower
Deadband