# Opcode: ERR
# Priority: Normal
# Services: DCC_CAB or DCC_CMD
# Parameters: AddrH (1 bytes), AddrL (1 bytes), ErrorCode (1 bytes)
# Conditions: Sent by a command station in response to a DCC command to report an error.
# Direction: From command station to cab
# States / Modes: 
# Result: See table below for the use of the Data fields.