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XTC/3 Operating Manual
seconds (256 timer ticks / 4 per second). Therefore, to get current data, the timer
tick must first be extracted from a prior command and then incremented every 250
msec and inserted in the S0 as the <Action Value>.
Response:
<Byte|Integer|Float>(<Byte|Integer|Float>…<Byte|Integer|Float>
Integer = 4 byte, low to high
Float = 4 byte, ANSII standard, single precision, low to high
Table 5-4 Standard Status commands
S
(0x53)
Command ID
Description
Response:
Description (Data Format) Units -Detail-
0
(0x00)
Process
Information:
(only valid for
specific timer tick
requested)
Returns the following
for the timer tick (0x00 to
0xFF) sent
Crystal Status (1 byte)
Bit 0 - 0 = Good, 1 = Failed Crystal
Bit 1 - 0 = Not Switching, 1 = Switching crystal
Bit 2 - 0 Good Reading, 1 = Invalid Reading
(reading is invalid during resonance recovery
time of several seconds following loss of sensor
crystal frequency measurement)
State (1 byte)
Active Sensor (1 byte)
Active Crystal (1 byte)
*
Rate (Float) -One second average-
Thickness (Float)
Power (Float)
*Rate Deviation (Float)
Frequency (Int DDS units). -Multiply by
0.0034924596 to convert to hertz.
Returns No Data if the requested timer tick has
no new data to send.-
* If in Stop or not in Deposit, Rate and Rate
Deviation return values of zero.
Procedure for extracting the Invalid Reading byte
from the Crystal Status
byte:
1. Send the S1 command to get the rate.
2. From the resulting response packet, find the timer tick value in the fourth
byte of the response packet.
3. Append this timer tick value to the S0 command and send it.
4. Extract the first byte from the Response Message part of the Response
Packet.
5. If bit 2 of that byte is 1, the Crystal Status is invalid, meaning the crystal is in
recovery mode. (The status correlates with the specific rate just received.)
6. Repeat steps 1 to 5