Sensoray 417 Manual do Utilizador descarregar pdf (Página 18)

17 Sensoray Model 417

Chapter 4 Programming

Read Channel

This command returns the most recently acquired sensor data from one channel. The returned

value is scaled as a function of the channel’s sensor type and is always represented as a signed,

16-bit integer. Refer to the Sensor Table at the end of this chapter for a list of sensor scaling fac-

tors.

COMMAND: (Chan)

RESPONSE: (Data MSB), (Data LSB)

VB Code Example:

‘****************************************************************

‘ Return the most recent Engineering Units data from any channel.

‘****************************************************************

Sub ReadChannel!(BasePort%, Channel%, Scalar!)

‘ Send command to 417 (Opcode = 0)

Call SendByte(BasePort, Channel)

‘ Read chan data from 417 and convert to Engineering Units

ReadChannel = ReadWord(BasePort) * Scalar

End Sub

‘**************************************************************

‘ Assume channel 6 has been configured for 5-Volt input signal,

‘ 200uV per bit. Read the voltage measured at channel 6.

‘**************************************************************

Dim ChanSixVolts As Single

Dim Scalar As Single

Scalar = 0.0002 ‘ From Sensor Tables, scalar = 200uV/bit

ChanSixVolts = ReadChannel(BaseAdrs, 6, Scalar)

‘**************************************************************

‘ Assume channel 4 has been configured for a K thermocouple,

‘ 0.1C/bit. Read the temperature measured at channel 4.

‘**************************************************************

Dim DegreesC As Single

DegreesC = ReadChannel(BaseAdrs, 4, 0.1)

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Sensoray 417 Manual do Utilizador Página 18