MuxSelect (Multiplexer Channel Select)
The MuxSelect instruction is used to select a specified channel on an AM16/32A or AM16/32B multiplexer.
Syntax
MuxSelect ( ClkPort, ResetPort, ClockPW, MuxChan, Mode )
Example
The following program shows the use of the MuxSelect instruction to measure and control a multiplexer.
'Multiplexer in 4x16 Mode
'Declare Variables and Units
Public SEVolt(9)
Units SEVolt=mV
'Define Data Tables
DataTable (Hourly,True,-1)
DataInterval (0,60,Min,10)
Sample (9,SEVolt(),FP2,False)
EndTable
DataTable (Daily,True,-1)
DataInterval (0,1440,Min,10)
Average (9,SEVolt(),FP2,False)
EndTable
'Main Program
BeginProg
SW12 (
'Main Scan
Scan(30,Sec,1,0)
'>>>>>>>>> Set 1
'Turn AM16/32B Multiplexer On, start measurements on mux channel 1
MuxSelect (C1,C2,20,1,1)
'3 repetitions, writing to SEVolt(1), SEVolt(2) and SEVolt(3)
'3 repetitions, measuring 1H, 1L, 2H on mux
'>>>>>> Set 2
PulsePort (C1 ,10000) 'to move to Set 2
'start measurements on mux channel 3
'3 repetitions, writing to SEVolt(4), SEVolt(5) and SEVolt(6)
'3 repetitions, measuring 3H, 3L, 4H on mux
'>>>>>> Set 3
PulsePort (C1 ,10000) 'to move to Set 3
'3 repetitions, writing to SEVolt(7), SEVolt(8) and SEVolt(9)
'3 repetitions, measuring 5H, 5L, 6H on mux
'Turn AM16/32B Multiplexer Off
PortSet (C2,0)
'Call Data Tables and Store Data
CallTable Hourly
CallTable Daily
NextScan
EndProg
Remarks
This instruction "wakes up" the multiplexer and clocks it to the specified starting channel. It can be used in conjunction with the SubScan and PulsePort instructions to step through the multiplexer's measurement channels to make measurements.
When measurements are completed, the ResetPort should be set low using PortSet to turn off the multiplexer (see example).
Parameters
ClkPort (Clock Port)
The port used to clock the multiplexer (for example, advance its channel). One clock port may be used to clock several devices. An alphanumeric code is entered for this argument.
| Code | Description |
|---|---|
| C1 | Control Port 1 |
| C2 | Control Port 2 |
| C3 | Control Port 3 |
| C4 | Control Port 4 |
| U1 | Universal Terminal 1 |
| U2 | Universal Terminal 2 |
| U3 | Universal Terminal 3 |
| U4 | Universal Terminal 4 |
| U5 |
Universal Terminal 5 |
| U6 | Universal Terminal 6 |
| U7 | Universal Terminal 7 |
| U8 | Universal Terminal 8 |
| U9 | Universal Terminal 9 |
| U10 | Universal Terminal 10 |
| U11 | Universal Terminal 11 |
| U12 | Universal Terminal 12 |
Type: Constant
ResPort (Reset Port)
The control port that will be used to wake up and reset the multiplexer. If multiple multiplexers are used in the program, each multiplexer must have its own unique ResetPort. An alphanumeric code is entered for this argument. Right-click to display a list.
| Code | Description |
|---|---|
| C1 | Control Port 1 |
| C2 | Control Port 2 |
| C3 | Control Port 3 |
| C4 | Control Port 4 |
| U1 | Universal Terminal 1 |
| U2 | Universal Terminal 2 |
| U3 | Universal Terminal 3 |
| U4 | Universal Terminal 4 |
| U5 |
Universal Terminal 5 |
| U6 | Universal Terminal 6 |
| U7 | Universal Terminal 7 |
| U8 | Universal Terminal 8 |
| U9 | Universal Terminal 9 |
| U10 | Universal Terminal 10 |
| U11 | Universal Terminal 11 |
| U12 | Universal Terminal 12 |
Type: Constant
ClockPW (Clock Period)
Used to control the period of the clock used to advance the multiplexer. The value is entered in milliseconds.
Type: Constant
MuxChan (Multiplexer Channel)
Specifies the first measurement channel on the multiplexer. It can be a constant or a variable.
Type: Constant or variable
Mode
Specifies what type of clocking will be used. Enter 0 for AM16/32A clocking and 1 for AM16/32B clocking.
Type: Constant