Alicat Scientific EPC Series Manual de instruções - Página 11
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Commanding a New Setpoint
Before attempting to send setpoints to your flow controller serially, confirm
that its setpoint source is set to serial by checking register 20.
Read Register 20:
For an EPC set to control forward pressure or an EPCD, if the value in register
20 is less than 16384, it's already set up to receive setpoints serially. If not,
subtract 16384 to current value using the subtract command below.
For an EPC set to back pressure control, if the value in register 20 is less than
49152, it's already set up to receive setpoints serially. If not, subtract 16384
to current value using the subtract command.
Subtract from Register 20:
There are two ways to command a new setpoint over a serial connection, as
described below. In either of these methods, the data frame returns the new
setpoint value when it has been accepted as a valid setpoint.
Sending Setpoints as Floating Point Numbers
This is how to send the desired setpoint value as a floating point number in
the engineering units selected:
New setpoint:
Example:
When using a pressure controller with a negative pressure range or a
bidirectional range, negative sent points are sent by adding the minus sign.
New setpoint:
Example:
[unit ID]r20
Example:
ar20
[unit ID]w20=~16384
Example:
aw20=~16384
[unit ID]s[floating point number setpoint]
as5.44
[unit ID]s[floating point number setpoint]
as-5.44
(setpoint of +5.44 inH2OG)
(setpoint of -5.44 inH2OG)
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