• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1365
  • Last Modified:


I am writing code that bypasses an old legacy application that uses rs422 to control 4 led display boxes (all connnected)
I have been using "PortMon" to check the messages going out.

Currently I get the information appearing in the first box but not the other 3 even though the chars being sent are the same.

One difference I have seen using PortMon is that the IOCTL_SERIAL_GET_COMMSTATUS is not being sent via my code. The other IOCTL code looks right although this is all happing automatically rather than being anything I have written myself.

Does anyone know why this message is not being sent?

I am using a MOXA UPort 1150 usb to serial converter.
  • 2
1 Solution
jetbetAuthor Commented:
As there are no responses I will close this question
jetbetAuthor Commented:
No responses
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now