Real Time Clock

Appendix C	Registers, Data Formats, & Queries

1.IEEE 488

PRINT#1, “SPOLL 07"

INPUT #2, S%

IF (S% and 128 = 128) THEN

PRINT “Buffer Overrun Occurred”

ENDIF

2.IEEE 488 and RS-232

PRINT#1, “OUTPUT07; U1X”

PRINT#1, “ENTER07"

INPUT #2, S%

IF (S% and 128 = 128) THEN

PRINT “Buffer Overrun Occurred”

ENDIF

Buffer Overrun With One Trigger Block

When only one trigger block is in the buffer, a buffer overrun will erase the entire pre-trigger. If the controller was reading pre-trigger data from the buffer, the next scan read will be the trigger point.

If no pre-trigger was configured or the pre-trigger has already been read, a buffer overrun will only erase the oldest scan in the buffer. If the scan being erased is currently being read, the contents of the read scan will be in error. If an overrun condition is detected by the controller during a read operation, any further reading must be considered corrupt until a buffer reset is issued. This can be done by either resetting the buffer with a *B command and/or reading the remaining data out of the buffer until it is clear.

Buffer Overrun With Multiple Trigger Blocks

When more than one trigger block is in the buffer, a buffer overrun will erase the oldest trigger block. If the block being erased is currently being read, the block read will be terminated and the read pointer will be advanced to the start of the next block. If an overrun condition is detected by the controller during a read operation, any further reading must be considered corrupt until a buffer reset is issued. This can be done by either resetting the buffer with a *B command and/or reading the remaining data out of the buffer until it is clear.

ChartScan has a programmable battery-backed, real-time clock with a resolution of 1mS. The clock is initially set to Eastern Standard time (U.S.). The time and date are used to tag the trigger point in each trigger block and HLL register. This data is incorporated into the Acquisition Buffer.

Open Thermocouple/Range Error Checking

ChartScan has built-in facilities for detecting open thermocouple and range errors, one in hardware and two in software:

•In hardware, the thermocouple cards contain circuitry to detect open thermocouples.

•In software, software detection routines exist to sense if the input a/d maximizes and to detect if an input exceeds the linearization limits.

If an open thermocouple/range error is detected, the Error Status Register will be set denoting that this particular error condition exists. The offending channel(s) can be determined by reading their values. If a channel is in error, its value will be:

±3276.70 if temperature channel (assuming units of °C) ±005.7670000 if Volts channel

Note: Open thermocouple/range error checking is only performed on channels previously activated by the C Command.

ChartScan User’s Manual

C-19

1400 specifications

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Omega Vehicle Security 1400 manual Real Time Clock, Open Thermocouple/Range Error Checking

Models: 1400

Appendix C