This is something I'd also like to see. In addition to Framing Errors, a "Comms Status Extended" PID could use the SIP Mechanism defined in E1.11 to validate the checksum for NSC packets.
Something like:
GET:
NSC Packet Count
NSC Min Length
NSC Max Length
NSC Checksum Errors (using the Previous Packet Checksum from the SIP)
SIP Packet Count
Text Packet Count
UTF-8 Packet Count
Framing Error Count
SET:
Reset All Counters
Such a mechanism could provide an automatic way to detect data communication link errors.
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