PulsePort (Toggle Port State)

The PulsePort instruction is used to toggle the state of a port, delay, and then toggle the port again.

Syntax

PulsePort (Port, Delay )

The following program shows the use of the PulsePort instruction to measure 10 thermocouples attached to an AM16/32 multiplexer.

'CR6
'Declare Variables and Units
Dim LCount_4
Public Batt_Volt
Public RefTemp
Public Temp_C(10)

Units Batt_Volt=Volts
Units RefTemp=Deg C
Units Temp_C=Deg C

'Define Data Tables
DataTable(Table1,True,-1)
  DataInterval(0,60,Min,0)
  Sample(10,Temp_C(1),FP2)
EndTable

'Main Program
BeginProg
  Scan(30,Sec,1,0)
    'Default Datalogger Battery Voltage measurement Batt_Volt:
    Battery(Batt_Volt)
    '107 Temperature Probe measurement RefTemp:
    Therm107(RefTemp,1,U1,U5,0,15000,1.0,0.0)

    'Turn AM16/32 Multiplexer On
    PortSet(C1,1)
    LCount_4=1
    SubScan(0,uSec,10)
      'Switch to next AM16/32 Multiplexer channel
      PulsePort(C2,10000)
      'Type T (copper-constantan) Thermocouple measurements Temp_C on the AM16/32Multiplexer:
      TCDiff(Temp_C(LCount_4),1,mv200C,U7,TypeT,RefTemp,True,0,15000,1,0)

      LCount_4=LCount_4+1
    NextSubScan
    'Turn AM16/32 Multiplexer Off
    PortSet(C1,0)
    'Call Data Table and Store Data
    CallTable(Table1)
  NextScan
EndProg

Remarks

This instruction toggles a port, delays the specified amount of time, toggles the port, and then delays a second time. The second delay in the instruction allows it to be used to create a 50 percent duty cycle clock for clocking multiplexers.

Parameters

Port

The number of the port to use in this instruction. An alphanumeric code is entered. 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

Delay

The amount of time, in microseconds, to delay after toggling the port. The delay is used after both the first and second toggles of the port.

Type: Constant