Mitsubishi Electronics PAC-YG31CDA User Manual download pdf (Page 10)

4.Functional s

ecification

4.1 Communication Protocol Specification

1) Protocol Outline

BACnet/IP which applied to ANSI/ASHRAE 135-1995, 135a, 135b correspondingly on UDP/IP

of Ethernet is used.

APDU of BACnetNPCIof BACnetNETWORK

BVLL HeaderUDP Header IP Header Ether Header

2) Ether Header

A physical layer sets a transmission medium to 10 BASET by Ethernet.

3) IP Header

The private address of Class C is recommended (*1). Subnet mask 255.255.255.0

*1: Recommendation value (range) [192.168.1.1]～[192.168.254.254]

[192.168.0.0] and [192.168.255.255] do not use it.

4) UDP Header

The default UDP port of a unicast and broadcasting is set to 47808 (OxBAC0).

5) BVLL Header

BVLC type (one octet) 0x81 fixation (BVLL to BACnet/IP)

BVLC function (one octet) 0x0A At the time of a unicast

0x0B At the time of broadcasting

BVLC length (two octets) Arbitrary (wording-of-a-telegram length setup: a big endian specification)

6) NPCI of BACnetNETWORK

Version (one octet) 0x01 Fixation

Control (one octet) 0x04 Those with a response message

0x00 With no response message

7) APDU of BACnet

It has arbitrary lengths of 1024 or less octets. Contents details are ANSI/ASHRAE135-1995, 135a, 135b

references.

8)Application of BACnet

・The instance number of a Device object 3(Setting change of a instance number is possible)

・Segmentation Transmission and reception are un-supported.

・APDU which can be received 1024 octet

・APDU timeout 3 sec(Setting change of a instance number is possible)

・Vender ID 99

・Process ID blank (Setting change of a process ID is possible)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 45 46

No comments

Mitsubishi Electronics PAC-YG31CDA User Manual Page 10