B&B Electronics 232OPSDA manual Read Digital I/O Command

Step 5 - Repeat Step 3 and 4 until each channel has been completed.

Step 6 - The various A/D channels have signal conditioning, so mathematical manipulation of the voltage read will have to be performed. See Chapter 4 for the equations.

Example 5.1 - Read A/D channels 1 and 0

gain0 = 23.064 gain1 = 1!

channel = 1

Command$ = “!0RA” + CHR$(channel) Print #1, Command$;

‘Get the value of channel 1 MSB$ = INPUT$ (1, #1)

LSB$ = INPUT (1, #1)

ad1 = (ASC(MSB$) * 256) + ACS(LSB$) reading1 = 5! * ad1 / (gain1 * 4095!)

‘Get the value of channel 0

MSB$ = INPUT$ (1, #1)

LSB$ = INPUT$ (1, #1)

ad0 = (ASC(MSB$) * 256) + ACS(LSB$)

reading0 = (((ad0 * 1000!) / 4095!) * 5!) / (10!

*

gain0)

The value of reading1 is the result of the A/D conversion on channel

1.The value of reading0 is the result of the A/D conversion on channel 0.

Read Digital I/O Command

The Read Digital I/O command returns a byte which represents the states of the digital input and digital output. Bit 0 corresponds to the state of digital output. Bit 3 corresponds to the state of digital input. If a bit is a 0 then the digital state of that digital I/O is LOW. If a bit is a 1 then the digital state of the I/O is HIGH.

24Documentation Number 232OPSDA1397 Manual

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