5
SECTION II
PACS
®
Read Only Parameters
ANALOG COMMAND INPUT
00B0 DOUB
The DHC controller can be configured to control
an automated valve using an Analog Command Input
signal, such as 4-20mA. This parameter can be read as a
DOUB byte value as shown below:
PACS
®
Command (RD#B0):
51 00 B0
Returned Data (example):
0D 9E
The returned data is a 16 bit value (DOUB byte) ranging
from 0 to 10000 and represents a reading of 0% to 100%
open. In the example above, $0D9E (3486 decimal)
represents a value of 34.86% open. The DHC
automatically scales this parameter according to the type of
analog signal selected:
Analog 0% 100%
Input Reading Reading
4-20mA 4mA 20mA
1-5V 1V 5V
2-10V 2V 10V (DHC-400 only)
0-5V 0V 5V
0-10V 0V 10V
If the analog signal is not connected to the DHC
controller, a reading of 0% is returned. A reading of 0% is
also returned when the analog signal is less than 4mA for a
4-20mA signal, and less than 1V for a 1-5V signal. If the
analog input signal exceeds the value associated with
100%, a reading of 100% is returned. If the DHC is
configured for a Digital command type, a reading of 0% is
returned. A digital command input must
come from the
bus, and can be read and written using the PACS
®
Command Input parameter (see Section III).
The command input type cannot
be selected via the
bus, and must be configured at the DHC using the
COMMAND TYPE mode. However, the setting can be
read using the Configuration parameter.
BATTERY VOLTAGE
(DHC-400 only)
00B2 DOUB
The DHC-400 controller monitors the Battery
Voltage, or the DC power source, that is used to power the
unit and the actuator's motor. This parameter is a DOUB
byte value that is automatically scaled from 0 to 3200
which represents 0 to 32.00 volts. Internally, the DHC-400
monitors the battery voltage to detect when a low battery
voltage condition occurs and provides a low battery voltage
alarm (see Alarm Flags 2). In the following example,
$09A0 (2464 decimal) represents a voltage of 24.64V.
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