Panasonic FP2 ET-LAN Technical Manual page 99

The station number of the station sending the command is specified for "Source for MEWTOCOL
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station number".
The station number of the station receiving the command is specified for "Destination for MEWTOCOL
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station number".
With commands, the same value should be specified for the "Hierarchy level (LEVEL)" and "Hierarchy
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depth (DEPTH)" parameters.
With responses, "Hierarchy level (LEVEL)" is fixed at 00H.
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"Destination (Source) MEWTOCOL station No." is specified by converting to hexadecimal data.
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Key Point:
The route number is a number that is automatically allocated to differentiate units if multiple link-related
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units are being used on the same backplane.
With the FP2, this applies to ET-LAN units, multi-wire link units, and computer communication units.
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Route numbers proceed in sequential order (1, 2, 3 ...), starting from the unit nearest the CPU unit.
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I/O units other than link-related units and advanced-function units are not included in these "routes".
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