GE F650 Instruction Manual page 585

Digital bay controller

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B.5 OUTPUT WRITING

With this frame the buffer pointer will be set over the 7421 event, which in the example is the oldest one in the buffer, so it

will send back all events until number 7435.

Now, to read the following 15, from 7436 to 7450, it is necessary to calculate the initiation address and send another frame:

0x1D0C AND 0x00FF=

0xFD00+0x0C=

[0xFE 0x03 0xFD 0x0C 0x00 0x69 0x60 0x44] ---------> RELAY

So, it will be asked until the relay responds 0 in one of the events, or reading address 0x03FF and checking the event

number from the last event read.

Second possibility: read directly the memory from the 0xFD00 to 0xFDFF address and then arrange by event number.

From that moment, only the new ones must be requested.

In the 0x03FF address there is the number of the following event that is going to be written, therefore, it is possible to know

how many events must be read from the last time that the relay was asked. If the relay indicated that the new event to be

generated is the 7677.

(NOTE: the 0x03FF address will have the event number 7677, because the last one is 7676).

Supposing that we all events until number 7674 have already been read, now a frame must be sent to read the

corresponding 28 bytes to events 7675 and 7676, given that there are only two new events from the last time that they were

Hex(7675)=0x1DFB

0x1DFB AND 0xFF=0xFB

0xFD00+0xFB=0xFDFB: reading address (*)

[0xFE 0x03 0xFD 0xFB 0x00 0x0E 0x90 0x5C] ---------> RELAY

0xFD0C: initiation address

F650 Digital Bay Controller

GEK-106310AB