Mitsubishi PAC-YG31CDA CONNECTION SPECIFICATIONS
A
BACnet Connection Specifications
BACnet Interface
( PAC-YG31CDA)
MITSUBISHI ELECTRIC
MITSUBISHI ELECTRIC CORPORATION
IR-CONDITIONING & REFRIGERATION SYSTEM WORKS
WSN04-2507
1. Outline
This document is applied to the communication specifications of BACnet Interface which answers the BACnet
service in which the multi-air-conditioner for Mitsubishi Electric is specified by ANSI.ASHRAE
135-1995,135a,135b.
2. System Configuration
2.1 Whole Composition
Ether BACnet
Building management system [BMS]
BACnet IF
Software
Air-conditioning system
HUB
G-50A
No.01
IC01IC
G-50A number
Group number
G-50A
No.02
IC
01
2.2 Requirements (system recommendations)
Item Contents Note
PC PC/AT interchangeable machine
CPU Pentium 4 1.8GHz or faster
Memory 256 MB or more
HDD 2GB or more 4GB or more of C drive free space
Storage
device
Resolution 1024 × 768 or higher, 65536 colors or more
LAN 2 port or more
OS Windows XP Professional
Other PC must be dedicated for this use (BACnet IF). It is always used as operation for 24 hours.
CD- ROM drive It is used at the time of installation of
Internal LAN (10Mbps)
Service Pack 1 and above
02
Group
No.01
IC
02
Group
No.01
IC
03
Group
No.03
IC
03
IC
04
IC
04
Group
No.04
IC
05
Unit Address
IC
05
necessary
BACnetIF.
Purchase the option, or use the equipment
recommended for the PC when purchasing
the PC
English version only
*PC must support each OS.
* A PAC Outdoor unit and
remote controls are
omitted.
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WSN04-2507
3. Communication Protocol Specification
3.1 Protocol Outline
BACnet/IP which applied to ANSI/ASHRAE 135-1995, 135a, 135b correspondingly on UDP/IP of Ethernet is used.
BVLL HeaderUDP HeaderIP Header Ether Header
NPCIof BACnetNETWORK
3.2 Ether Header
A physical layer sets a transmission medium to 10 BASET by Ethernet.
3.3 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.
3.4 UDP Header
The default UDP port of a unicast and broadcasting is set to 47808 (OxBAC0).
3.5 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)
APDU of BACnet
3.6
NPCI of BACnetNETWORK
Version (one octet) 0x01 Fixation
Control (one octet) 0x04 Those with a response message
3.7 APDU of BACnet
It has arbitrary lengths of 1024 or less octets. Contents details are ANSI/ASHRAE135-1995, 135a,
135b references.
3.8 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 3sec(Setting change of a instance number is possible)
・Vender ID 99
・Process ID blank (Setting change of a process ID is possible)
0x00 With no response message
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WSN04-2507
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