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CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
The filter equation for the transducer is as follows where FL is set to 90: If the change in pressure
reading is less than 0.02% of the last pressure reading sampled at a 20 mS rate, then the pressure
reading = (last filtered pressure * 90%) + (current sampled pressure * 10%). Otherwise the pres-
sure reading is equal to the current sampled pressure. Default setting is 90% filtering.
Consequently, the readings from the previous active turndown in the reading buffer of the device
affect the current reading. The amount the new reading is affected is a function of the size of the
filter percentage setting of the active turndown. The largest offset that will be reported by the
newly
active turndown is 0.02% FS of the current range. In applications where readings must not slew in
immediately after a turndown switch is made, it is advisable to set the filter to zero or to program a
delay before the new turndown is read.
6.2 Serial Port Configuration
Unless otherwise requested by the customer, the CPT6010 serial ports are set at the factory to the
default values listed in the following table.
Table 6.2 - Serial Port Settings
Item
Value
Type
RS-232
Address
1
Baud
9600
Data Bits
8
Parity
None
Stop Bits
1
6.3 CPT6010 Address
Each CPT6010 is assigned address “1” at the factory. In a multiple CPT6010 system each trans-
ducer must have a unique address. Valid addresses are 0 through 9 and A through Z (upper and
lower case are interpreted the same).
6.3.1 Addressing Devices with two Turndowns
A circumstance that must be taken into consideration by users of CPT6010’s with two turndowns is
the possible use of different addresses on separate turndowns of a single transducer. For example,
if the primary turndown is set to address X and the second turndown is set to address Y, if a user
switches from turndown one, and attempts to address the secondary turndown with address X, the
secondary range of the device will not respond. The simplest solution to this problem is to set both
turndown addresses to the same value. Alternately, if the device is not being used in a multi-drop
application, the user can simply address both ranges with the wildcard address character (see
