Fluid Components International MT91 Manual Operation User Manual
Page 16
FLUID COMPONENTS INTL
CHAPTER 3 - OPERATION
Model MT91 Multipoint Flowmeter
3 - 16
Doc. No. 003185 Rev. B
The filter uses the following equation to adjust the output signal.
V
V
V
V
f
n
c
s
c
= +
−
(
)
V
n
= New or desired value
V
c
= Current Value
V
s
= Sample Value
f
= Filter Strength
Ø To change the filter strength:
1.
Go to menu level 2.2.4 (Setup
Þ
Outputs
Þ
Filter).
2.
Enter desired filter strength.
Serial Communications
The flowmeter has one serial port that can be configured to use one of three EIA standard interfaces: EIA-232C,
EIA-422, or EIA-485. The data transfer rate can be set to either 4800, 9600, or 19200 baud. The number of bits in a
character is set to eight, and no parity bit is used.
Ø To use serial communications:
1.
Go to menu level 2.3.3 (Setup
Þ
Communications
Þ
Protocol).
2.
Select 1=Pro1 or 3=Pro 3. Protocol 1 is a command and response protocol. Protocol 2 is not defined. Protocol
3 is a limited command and response protocol used to extract flow and raw signal data for up to 4 sensing points.
3.
Set the data transfer rate, character bits, and parity bit on the host system.
4.
To use protocol 1, refer to Table 3-4 for a list of commands and responses. These commands must be entered in
capitalized letters to be recognized by the system.
5.
To use protocol 3, use the single character 'F' (flow) followed by a carriage return to display 4 sets of flow
values. Use the single character 'R' (resistance) to display 4 sets of sensing point resistance values.
Time Delay
The time delay function freezes the outputs for an operator specified time period.
Ø To use time delay:
1.
Go to menu level 7.0 (Time Delay).
2.
Enter the amount of time in minutes desired for the delay length.
3.
The instrument will count down the time, while freezing the output. Any key can be pushed to exit the time
delay. When the time has expired the instrument will continue with normal operation.