80-4280-10, Rev. 4
APPENDIX
Serial Commands
68
Demand Signal Commands
Command
Description
Argument
n
and Information
dem0pctma
n
Sets/displays the Demand signal value that
corresponds to 0% actuator position.
n
= Demand signal as a decimal
in mA. Minimum value is 0.50;
maximum value is 100%
Demand less 4.00 mA (e.g., if
100% Demand is 20.00 mA, the
0% value must be set for 16.00
mA or less).
dem100pctma
n
Sets/displays the Demand signal value that
corresponds to 100% actuator position.
n
= Demand signal as a decimal
in mA. Minimum value is 0%
Demand plus 4.00 mA (e.g.,
if 0% Demand is 4.00 mA, the
100% value must be set for 8.00
mA or greater). Maximum value
is 21.00 mA.
demlos
n
Sets/displays the Demand signal threshold, below
which the DCM-2 recognizes the signal has been
lost. The threshold is entered as a value in mA.
This command also sets/displays the action initiated
by the actuator during LOS (Loss Of Signal). LOS
action options are "sip" (stay in place) or "gtp" (go to
position). Demlos always reports both settings, but
only sets one argument at a time. Demlos must be
used twice to set both the threshold and action.
n
= Demand signal in mA below
which LOS occurs (e.g., the
typical value for a 4–20 mA
system is 3.20).
-OR-
n
= "sip", "gtp" or "pat". The
"pat" argument acts the same
as "sip", but also suppresses
the alarm-- this is used in some
pulsed applications.
demlosgtp
n
Sets/displays the position to which the actuator will
run upon loss of the Demand signal (LOS). This
command has no effect if the actuator is set to "sip"
(stay in place).
n
= desired position of actuator
expressed as a percentage of
actuator travel in decimal form
(e.g., 50% = 50.00).
trimdem4ma
4
Trims the Demand analog-to-digital sensing circuit
to be accurate at 4 mA. This command should only
be used when the Demand signal at the actuator is
exactly 4.0 mA. Trim is factory set and should not
normally require recalibration.
"
4
" is the only acceptable value;
this trim can only be performed
at 4 mA.
trimdem20ma
20
Trims the Demand analog-to-digital sensing circuit to
be accurate at 20 mA. This command should only
be used when the Demand signal at the actuator is
exactly 20.0 mA. Trim is factory set and should not
normally require recalibration.
"
20
" is the only acceptable
value; this trim can only be
performed at 20 mA.
