Mode Cold Cathode - thyracont VSM72 Betriebsanleitung

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4.5

Mode Cold Cathode

For certain vacuum processes it may be favoured to suppress the start of the
cold cathode sensor, which is automatically controlled by the transducer
electronics. Therefore it is possible to disable the cold cathode by software
command via RS485 interface:
"0":
"1":
When the cold cathode is disabled your VSM72 behaves like a Pirani transducer
with range 1000 – 1x10
means that actual pressure is below 1x10
Address
Address:
Code:
Data:
cks:
CR:
Example (for address-switch in position "1")
Action
Enable cold cathode
Disable cold cathode
Read mode cold cathode
Please find further information about the Thyracont communication protocol in
chapter 4.2.
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Mode " disabled " cold cathode sensor remains switched-off
Modus " enabled "
the transducer (standard)
-4
mbar. Correspondingly the output "ur" in this case
Parameter "Mode Cold Cathode" is only temporarily saved in
the transducer memory. After mains supply is switched off or
disconnected the VSM72 will always be in mode "cold cathode
enabled" !
Code
3 Bytes, decimal; address space RS485: 001 – 999
"I" for reading, "i" for writing the parameter
1 Byte; "1" to enable, "0" to disable the cold cathode sensor
1 Byte, checksum, defined as sum over all Bytes of the fields
address, code and data, modulo 64 plus 64.
Carriage Return (0Dh, 13d)
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start of cold cathode is automatically controlled by
-4
mbar.
Data cks
:
Telegram to
transducer
C
"001i1k "
R
C
"001i0j "
R
C
"001IZ "
R
CR
Answer telegram
from transducer
C
"001i1k "
R
C
"001i0j "
R
C
"001I1K "
R
( enabled)