PortPairConfig (Set Port Pair Voltage)
The PortPairConfig instruction is used to set up the voltage for a pair of terminals on the datalogger.
Syntax
PortPairConfig ( Port, Option, PullOpt [optional] )
Example
Following is a simple example of using PortPairConfig to set the voltage output for C1 to 3.3V. The scenario would be that the port is turned on to power a sensor that requires 3.3V, a delay occurs, the sensor is measured, and then the port is turned off. Note that C2 would also be set to 3.3V with this instruction, since the ports are configured in pairs.
Public Sensor
BeginProg
PortPairConfig (C1,2)
Scan (1,Sec,3,0)
PortSet(C1,1)
Delay (0,100,mSec)
'measure sensor
Portset (C1,0)
'Other programming instructions
NextScan
EndProg
Remarks
By default, digital ports are set up for 5V. They can be set to 3.3V using this instruction. Ports are configured in terminal pairs – if C1 is set to 3.3V using this instruction, C2 is also set to 3.3V.
Parameters
Port
Specifies the port to be configured using this instruction. Right click to display a drop-down list box of valid options.
| Alphanumeric | Description |
|---|---|
| C1 | Datalogger control terminals 1 & 2 |
| C3 | Datalogger control terminals 3 & 4 |
| U1 | Universal terminal pair U1 (TX) & U2 (RX) |
| U3 | Universal terminal pair U3 (TX) & U4 (RX) |
| U5 | Universal terminal pair U5 (TX) & U6 (RX) |
| U7 | Universal terminal pair U7 (TX) & U8 (RX) |
| U9 | Universal terminal pair U9 (TX) & U10 (RX) |
| U11 | Universal terminal pair U11 (TX) & U12 (RX) |
Type: Constant
Option
Sets the voltage for the port. This parameter has the following options:
| Code | Description |
|---|---|
| 1 | 5V (default) |
| 2 | 3.3V |
Type: Variable
Optional Parameter
PullOpt
Optional parameter that specifies the type of pull-up resistor to be used. If this parameter is left blank, the instruction defaults to 0 = pull down.
| Code | Description |
|---|---|
| 0 | Pull down (default) |
| 1 | Pull up |
Type: Constant