ABB LDMUI-001 61320946C Serial Port

Description

Some Serial I/O COMMREQs must complete execution before another COMMREQ can be processed.

Others can be left pending while others are executed.

6.2.5.1 COMMREQS that Must Complete Execution

■ Autodial (4400)

■ Initialize Port (4300)

■ Set Up Input Buffer (4301)

■ Flush Input buffer (4302)

■ Read port status (4303)

■ Write port control (4304)

■ Cancel Operation (4399)

■ Serial Port Setup (FFF0)

6.2.5.2 COMMREQs that can be Pending While Others Execute

The table below shows whether Write Bytes, Read Bytes and Read String COMMREQs can be pending

when other COMMREQs are executed.

This function is provided for compatibility with legacy Serial I/O applications. In PACSystems releases

5.70 and later, the internal input buffer is always set to 2097 bytes. In earlier PACSystems

implementations, the internal input buffer is set to 2K bytes.

The Set Up Input Buffer function returns a success status to the COMMREQ status word, regardless of

the buffer length specified in the command block.

As data is received from the serial port it is placed in the input buffer. If the buffer becomes full, any

additional data received from the serial port is discarded and the Overflow Error bit in the Port Status

word (See Read Port Status Function) is set.

6.2.7.1 Retrieving Data from the Buffer

Data can be retrieved from the buffer using the Read String or Read Bytes function. It is not directly

accessible from the application program.

If data is not retrieved from the buffer in a timely fashion, some characters may be lost.

Details: If you need an urgent delivery order, please feel free to contact us, and we will do our best to meet your needs.
Price issue: If you find that other suppliers offer a cheaper price for the same product, we are also willing to provide you with a reference price and give you further discounts.
Contact Us:+86 18106937731
Whatapp:+86 15359293870
Email: geabbdcs@gmail.com / 2872270648@qq.com
Contact Person: Chen

Stock products of the same series: