Using The Handshaking Lines For General Input/Output; The Output Pin (Rts/Pin 8 - Campbell SDM-SIO1A Instruction Manual

Hide thumbs Also See for SDM-SIO1A:

Table of Contents

Appendix A. Using the Handshaking Lines for General Input/Output

A.2 The Output Pin (RTS/Pin 8)

A-2

To set the output pin (RTS/pin 8) you must use the SerialOutBlock()

instruction.

The spare I/O lines are RS-232 lines, NOT logic lines. This means that the

output line voltage is –12V and +12V (approximately), not 0 and 5V.

The following examples show you how to set the output pin using the

SerialOutBlock() instruction.

CRBasic example for setting the output pin

SerialOutBlock(32, 1, 0)

SerialOutBlock(32, 0, 0)

The two example lines of code above will set the output pin on the

SDM-SIO1A high then low respectively on the SDM-SIO1A device set to

address 0 on its rotary switch.

Any value greater than 1 will set the output pin high, but usually the number 1

is used, as this will improve the readability of the code.

Value of SerialOutBlock

SerialExpression variable

Approximate voltage; do not drive relays or high current loads directly from this pin.

' This will set the spare output pin high

' This will set the spare output pin low

Voltage on the output line

+12V

–12V

Table of Contents

Sdm-sio4a