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ACH550-UH User’s Manual 1-235
Embedded fieldbus
Protocol Implementation Conformance Statement (PICS)
PICS summary
BACnet Standard Device Profile.
This version of ACH550 BACnet fully conforms
to the 'Application-Specific Controller' standard device profile (B-ASC).
Services Supported.
The following services are supported by the ACH550:
• I-Am (Response to Who-Is, also broadcast on power-up & other reset)
• I-Have (Response to Who-Has)
• ReadProperty
• WriteProperty
• DeviceCommunicationControl
• ReinitializeDevice
Data Link Layer.
The ACH550 implements MS/TP (Master) Data Link Layer. All
standard MS/TP baud rates are supported (9600, 19200, 38400 & 76800).
MAC ID / Device Object Instance.
The ACH550 supports separate MAC ID and
Device Object Instance parameters:
• Set the MAC ID using drive parameter 5302. Default: 5302 = 128.
• Set the Device Object Instance ID using drive parameters 5311 and 5317.
Default: Both 5311 and 5317 = 0, which causes the MAC ID to “double” as the
Device Object Instance. For Device Object Instance values not linked to the MAC
ID, set ID values using 5311 and 5317:
– For IDs in the range 1 to 65,535: Parameter 5311 sets the ID directly (5317
must be 0). For example, the following values set the ID to 49,134:
5311 = 49134 and 5317 = 0.
– For IDs > 65,335: The ID equals 5311’s value plus 10,000 times 5317’s value.
For example, the following values set the ID to 71,234:
5311 = 1234 and 5317 = 7.
Max Info Frames Property.
Configure the Device Object Max Info Frames property
using drive parameter 5312. Default: 5312 = 1.
Max Master Property.
Configure the Device Object Max Master property using drive
parameter 5313. Default: 5313 = 127.
MS/TP token counter
Parameter 5316 stores the count of MS/TP tokens passed to the associated node.