Cermet II User’s Manual
Michell Instruments 21
OPERATION
Register Address The register address for the read/write operation is specifi ed
next. It can be either an ASCII number from
0 to 255 or
registers 1 - 18 can be accessed by entering and ASCII letter
from
A to R (or a to r, not case sensitive). If the address
character is omitted in a read command, the meter will always
respond with the data value currently on the display. (The
register address must be specifi ed for a write command).
For a full list of the register, that can be read or written to,
see Appendix C.
Separator After the register address in a write command, the next character
must be something other than an ASCII number. This is used
to separate the register address from the data value. It can
be a space or a
comma or any other character except a $ or
a
*.
Data Value After the separator character, the data value is sent. It must be an
ASCII number in the range of
-32766 to 32766.
Terminate The last character in the message is the message terminator and this
must be either a
$ or a *. If the $ is used as a terminator,
a minimum delay of 50mS is inserted before a reply is sent.
If the
* is used as a terminator, a minimum delay of 2mS is
inserted before a reply is sent. (the
$ and * characters must
not appear anywhere else in the message string).
3.8 Pressure Compensation
Enter the PROGRAM UNLOCK mode as described in Section 3.1.
The monitor has the ability to measure pressure in order to provide a pressure
compensated value for PPM(V), lbs/MMSCF or g/m3.
3.9 Using a Pressure Transducer
In order to enable the use of a pressure transducer set CODE 4 to 307 (dual channel
mode), and while pressing
SETUP, press once. Release both buttons and keep
pressing
SETUP until CODE 4 is displayed.
• To display dew point whilst measuring pressure, set
CODE 4 to 307 to
show dew point in °C; or 317 for dew point in °F.
• To display pressure in psig set
CODE 6 to 000; or to display pressure in
barg set
CODE 6 to 100.
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