...
Bytes | 0 | 1 .. len-3 | len-2 . len-1 | len |
+-----+-----------------+----------------+-------+
Field | len | Modbus response | start register | count |
Compact Payload Format (Port 20, (21-59
...
) PlFmt=4&5)
The Modbus Bridge provides an alternative Payload Format for uplinks that uses the limited bandwidth more efficiently by only sending data. This requires a dedicated parser on the network server of application server that has knowledge of the device's configuration. The configuration can be requested from devices in the field with our Remote Configuration. Be aware that Error Conditions cannot be communicated as well in this format.
...
The Examples section contains an illustration of a split up Response.
Remote Config (Port 128 (129-131))
When Remote Configuration is enabled, you can send Downlinks on Port 128 to read or set Config Parameters and execute commands like Reboot. Responses to those Downlinks are set on port 128 (or 129-131 if they are too long for a single Uplink).
...