Networking Linear AMII / AMIII RS232 ports via Ethernet
 

Let me start off by saying we get plenty of calls about the feasibility of networking to any RS232/485 devices, often these are remote access controllers that people want to administer from the comfort of their own home or office. I also get plenty of calls from people asking for help on why their installation isn't working or is working intermittently. The most common problem seems to be baud rate!

First off lets start with a Linear Access AMIII. A very common controller that doesn't have an Ethernet interface (Linear it is 2014)...

Making the RJ45 to DB-9 interfacing cable.

Linear RS232 Cable DB-9 RJ45
 
RS232  RJ45 Pinout (from bottom)

RS323_RJ45

 
COM Settings

Baud Rate 9600 (See Notes)
8 Data Bits
No Parity
1 Stop Bit
X-ON/XOFF Data Flow Control

 
RS232 to Ethernet Converts LS100

I have had good luck using Sena Hello Device LS100 and the LS100W (wireless)
Sena LS100 Hello Device


 
Hello Device Manager Settings (LS100 Software)

NOTE THAT THE BAUD RATE SET AT 38400!!! even though the manual states to set it at 9600 I was never able to get it working with the serial to Ethernet adapter with the 9600 setting.

Settings Hello Device LS100


 
Serial IP Settings

Serial IP Hello Device LS100 Settings