GE SRTP specification

[mrbakara]

Hi all,
I know it's internal for GE, but anyone has the protocol spec or technical reference ?

[Mark-]

Hello,

I never found a published specification when I was looking for one several years ago. IIRC it was much like SNPX with an attach and establish session handshake before reading/writing data.

Also, I do not recall if Wireshark had a dissector for  SRTP.

You can use the demo of PeakHMI and in configuration mode capture the handshake and read commands. For write commands you would need to create points/tags and issue writes at runtime, still using the demo version.

 

 

 

[Steve Bailey]

Much like Modbus TCP is Modbus RTU for Ethernet, SRTP in GE's SNP protocol for Ethernet.

[Mark-]

Hello

Yeah, it is "much like." SRTP has much more overhead and has a session establish handshake after the attach. SNP only the attach IIRC.

Also like MODBUS TCP/RTU, the serial protocol has a CRC/LRC and the TCP protocol does not.