MS/TP: Zero Config, Auto Baud, and Who-Am-I ? #1017
Replies: 2 comments 1 reply
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Yes, zero-config MS/TP (automatic MAC address) and auto-baud enable a device to join an MS/TP network without having to be configured and using the default Device ID 4194303. The Who-Is service to 4194303, the Who-Am-I replies from the zero-config device or other devices that support Who-Am-I service, and You-Are service are then used to assign a unique site Device ID (instance, identifier) and optionally a different MAC address, by some supervisory device on the BACnet network, to the device receiving the You-Are service message. |
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Does bacnet-stack have service/handler for who-am-i/you-are? I didn't see
them when I looked.
…On Sun, Jun 15, 2025, 07:29 Steve Karg ***@***.***> wrote:
Yes, zero-config MS/TP (automatic MAC address) and auto-baud enable a
device to join an MS/TP network without having to be configured and using
the default Device ID 4194303. The Who-Is service to 4194303, the Who-Am-I
replies from the zero-config device or other devices that support Who-Am-I
service, and You-Are service then be used to assign a unique site Device ID
(instance, identifier) and optionally a different MAC address, by some
supervisory device on the BACnet network, to the device receiving the
You-Are service message.
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The enumerations for the services were added, but the encoders, decoders, unit tests, handlers, and example applications have not been added. I started a branch for these yesterday. |
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I see the functions
dlmstp_zero_config_enabled_setanddlmstp_check_auto_baud_set- should I enable these in the default state of my MS/TP device?Would that then allow the
Unconfigured Device Discovery and Address Assignmentof section 19.7 using theWho-Am-IandYou-Areservices?All reactions