15 Ethernet interface
4 registers are used:
-the service request register (STB) associated with its validation register.
-the standard event register (Event Status Register - ESR) associated with its validation register. The bits #0, 1, 2 and 7 of the STB register are available for use as summarisation messages specific to the appliance. Each of these bits can be associated with a data structure whose model is defined and that manages the events in the appliance that may induce a service request.
The user can configure the recorder so that it loads the bit #6 of the service request register if some particular events should occur.
In RS232 configuration, the service request register has to be read regularly to detect an event. The identification of the event is made by reading the status byte, then the associated event register(s).
Status of these registers at
The content of the STB, ESR and alarm registers is systematically reset to zero at
14.4.2.Registers of service request
7 6 | 3 2 1 0 | STATUS BYTE | |
REGISTER | |||
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| Read by : *STB? | |
& |
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| & |
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Logical | & |
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OR | & |
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& |
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&
&
{ 7 
5 
4 
3
2 
1 
0
Status register:
It includes the status byte of the appliance.
This status byte can be read in case of interrogation with the "*STB?" instruction. In this case, the bit #6 is MSS (Master Summary Status) that comes from the logical operations as shown in the above figure.
In fact, MSS is equal to 1 when at least one other bit is equal to 1 both in the status register and the validation register.
Composition of the STB register:
The bit #6 (value 64) includes the recapitulative message "MSS" (reading with "*STB?").
The service request takes place in the following cases:
-a bit of the status register of service request switches from 0 to 1 while the corresponding bit in its associated validation register is 1, and
-the bit #5 of the validation register of service request is 1 and a standard event occurs in the following conditions:
-a bit of the status register of the standard events switches from 0 to 1 while the corresponding bit in its validation register remains equal to 1
-a bit of the validation register of standard events switches from 0 to 1 while the corresponding bit in its status register is 1
-the bit #0 of the validation register of service request is 1 and a particular event occurs in the following conditions:
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