Rockwell-automation 1769-ASCII Compact I/O ASCII Module Manual de usuario descargar pdf (Pagina 71)

Rockwell Automation Publication 1769-UM012B-EN-P - January 2014 71

Chapter 3

I/O Memory Mapping

When both serial channels are active, you can alternate between receiving data in

the buffer from both ports simultaneously or one at a time.

ASCII Module Behavior when

not in Run Mode

The 1769-ASCII module transmits data out the serial port when the controller is

only in Run mode. It sends data once the Tx Transaction ID changes after the

controller transitions into Run mode.

The 1769-ASCII module delivers data received on the serial ports to the

controller even when it is not in Run mode. When not in Run mode, the module

acts as if Master Handshaking is not enabled. Therefore, new data is placed in the

input tag and the Rx Transaction ID increments. When it receives new serial data

after the transition to Run mode, the module follows whatever rules are

configured then. In your program, use the Rx Transaction ID value in the input

tag on the first scan to compare for new data.

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Rockwell-automation 1769-ASCII Compact I/O ASCII Module Manual de usuario Pagina 71