Chapter Nine: RS-232 Communications
Command Messages
279
Chapter References for Read Only Data Messages
Function
Chapter
Analog Set Point
Chapter Seven: Operation in Setup Mode
Channel Status
Applies to RS-232 messages only
see below
Power Up Status
Chapter Four: Operation in Normal Mode
Relay Status
Chapter Three: Overview
Alarm Status
Chapter Seven: Operation in Setup Mode
Current Control Mode
Chapter Eight: Operation in Control Mode
Current Recipe
Chapter Eight: Operation in Control Mode
Current PID Set Point
Chapter Eight: Operation in Control Mode
PCS Output
Chapter Three: Overview
Table 80: Chapter References for Read Only Data Messages
How To Report the Channel Reading with Time Stamp
The 146 instrument can report the channel’s reading with the time difference between readings.
A 16-bit counter tracks the elapsed time in 10 millisecond increments. The counter increments
by one count every 10 milliseconds, until it reaches a count of 65535 (approximately 65
seconds). The counter then wraps around and begins counting from 0 again. To calculate the
elapsed time between readings, subtract the time stamp of the first reading from the time stamp
of the second reading.
For example, you query the channel reading on channel 3, and the 146 responds with:
@6023:133 4261 <CR>
to indicate a pressure of 133 at the time equivalent to 4261 counts.
The next time you check the reading with time stamp, the 146 instrument responds with:
@6023:129 18784 <CR>
The time between the readings is:
18784 - 4261 = 14523 counts
Therefore, the time elapsed between readings is approximately 14.5 seconds.
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