AMX NetLinx NXM Series User Manual

Page 43

NXC-VAI4 Analog Voltage Control Card

NetLinx Cardframe, Control Cards, and NetModules

NXC-VAI4 Send_Commands (Cont.)

Command

Description

PE
Selects which voltage
reference (if any) is to be
used for scaling of the output
voltage.

The specified output will then remain proportional to the specified input.
Syntax:

SEND_COMMAND ,'PE B|U'

Variables:

OUTPUT: any Output ('1', '2', '3', or '4')
Reference selection:
’N’ - Normal/None: Uses no reference scaling.
’E’ - External: Use the External Reference input to scale the output.
’I’ - Input: Use the corresponding input as the reference for the
output.
B|U: Bipolar or Unipolar (has no meaning for reference selection 'N')
Unipolar mode sets the voltage range to between 0V and +reference
voltage.
Bipolar mode sets the output voltage range to between -reference voltage
and +reference voltage.

Examples:

SEND_COMMAND ,'P1EN'

Sets Output 1 to use no reference (MIN/MAX limits are used instead.).

SEND_COMMAND ,'P3EEU'

Sets Output 3 to use the External Reference input for scaling. The output
voltages will range from 0 to the external reference voltage.

SEND_COMMAND ,'P3EIB'

Sets Output 3 to use Input 7 for scaling. The output voltages will range
from -input reading to +input reading.

PL
Ramps the specified output
from its current level value to
the specified level value or
specified percentage of
maximum at the rate speci-
fied by "CURRENT OUTPUT
RAMP UP TIME" or
optionally in the specified
amount of time.

Syntax:

SEND_COMMAND ,'PL [T]'

Variables:

OUTPUT: Any Output ('1', '2', '3', or '4')
LEVEL VALUE: 0 - 255 or 0 - 100% (where 0 is low voltage)
TIME (optional): 0 - 255 in 0.1 second increments

Examples:

SEND_COMMAND ,'P1L50%'

Ramps Output 1 from its current value to 50% (mid voltage level) at the
"CURRENT OUTPUT 1 RAMP RATE".

SEND_COMMAND ,'P2L255T30'

Ramps Output 2 to maximum voltage level in 3 seconds.