11
CONFIGURATION
00CC SING
The Configuration parameter is a SING byte
value, where groups of bits are assigned to various DHC
controller settings. The bit assignments are shown below:
7 6 5 4 3 2 1 0
X
polarity
X X X
command type setting
X X
loss of command setting
X X
indeterminate
In the following example, $12 (0001 0010 binary)
indicates that the DHC controller is configured for a 4-
20mA command input and a loss of command setting that
will close the actuator upon a loss of command.
PACS
®
Command (RS#CC):
50 00 CC
Returned Data (example):
12
Bit 0 - "polarity"
This bit is automatically set by the DHC
controller's polarity detection feature, and is not
meaningful to the automation system except for
advanced trouble shooting purposes. When this bit
is "0", it indicates that the DHC's M1 output drives
the actuator in a direction that corresponds to a
decreasing voltage on the DHC's feedback
potentiometer WIPER input. The M1 output is the
one that turns on with the ▲ button when the DHC
controller is in the MANUAL mode. When this bit
is "1", it indicates that the M2 output (the ▼
button) corresponds to a decreasing voltage on the
WIPER input.
Bits 1, 2, & 3 - "command type setting"
These three bits indicate the command type the
DHC controller is expecting to use to position the
actuator in the AUTO mode. Only the values
shown below are returned.
3 2 1
0 0 0
Digital command (PACS
®
Command)
0 0 1
4-20mA command
0 1 0
1-5V command
0 1 1
2-10V command (DHC-400 only)
1 0 0
0-10V command
1 1 0
0-5V command
Bits 4 & 5 - "loss of command setting"
These bits indicate what action the DHC controller
will take when it detects a loss of command. Only
the values shown below are returned.
5 4
0 0
last position (DHC outputs disabled)
0 1
close (DHC moves to closed position)
1 0
open (DHC moves to open position)
Bits 6 & 7 - These bits are not used by the DHC controller
and should be ignored. Their value is unknown,
and therefore they are indeterminate.
OVERRIDE CONTROL
00CD SING
The Override Control parameter is a SING byte
value where bit 7 is "1" when override operation is enabled
by an external local/remote station. While in override
operation, the DHC controller is disabled (including the
three control panel buttons), and the local/remote station
has direct control of the DHC controller's outputs. When
bit 7 is "0", the DHC controller is in normal operation, and
the Mode parameter indicates the DHC's mode of
operation. The remaining bit assignments are shown
below.
7 6 5 4 3 2 1 0
X X
local/remote function
0 0 0 0 0
unassigned (always "0")
X
override status
In the following example, $82 (1000 0010 binary)
indicates that the DHC is in override operation and the
DHC output associated with the closed position is on.
PACS
®
Command (RS#CD):
50 00 CD
Returned Data (example):
82
Bits 0 & 1 - "local/remote function"
These bits are useful for trouble shooting problems
with the local/remote switches and indicate which
DHC output is turned on. Only the values shown
below are returned.
1 0
0 0
off (both outputs off)
0 1
open output on
1 0
close output on
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