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Page 17
8 Programme Memory Option
With the MEM-08 option, you can store up to 8 sets of configuration and
calibration data. This is useful if you want to connect a number of different
sensors, each with different calibration, to the meter, selected by rotary switch.
Each memory location can have its own input/display calibration, alarm settings,
and analogue O/P calibration. NB The linearisation facility is not available
with this option.
Memory locations are addressed using an external switch. If you need up to 4
memories, you may use a simple rotary switch. If you need more than 4 memories
you must use a BCD coded switch, as shown below.....
7 8 9 10
Common BCD 1 BCD 2 BCD 4
7 8 9 10
Common BCD 1 BCD 2 BCD 4
6
Simple rotary switch BCD coded switch
Programming Notes:
Memory location 0 is a ‘GLOBAL’ programming location. When you programme
location 0 , the same data will be written to all the other memory locations as
well. Therefore, always programme location 0 first. However if you switch off
the switch next to the input connector, before programming location 0, this effect
will not occur. The switch will then have to be set ON if you wish to access the
other memories. If this feature is undesirable in your system, you should limit
the number of programmes to 7 and arrange your switching to prevent location 0
from being accessed.(ie never have all BCD select lines disconnected from
Common)
All programmes are stored in non-volatile EEPROM memory, which has a typical
storage life of 10 years, and which does not rely on battery backup.
If you wish to use a rotary switch to
select up to 8 memory locations, and
to switch up to 8 two-wire signals,
we make a 1/8 DIN rotary switch
model SW2P8W-BCD for this
purpose.