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Communication operation and setting
(1) Specifications
Communication specifications (conforming to BACnet standard of physical medium EIA-485)
Node with network bias resistors
This product is a node with local bias resistors. Therefore at least one node must be a node with network bias resistors
in the network configuration.
When configuring the network with only this products, refer to the following, and make the node with network bias
resistors. (When using two sets in one segment, insert them into both end of the network.)
Item Description
Physical medium EIA-485 (RS-485)
Connection port RS-485 terminal (PU connector is not available)
Data transfer method NRZ encoding
Baud rate 9600bps, 19200bps, 38400bps, 76800bps
Start bit Fixed to 1Bit
Data length Fixed to 8Bit
Parity bit Fixed to none
Stop bit Fixed to 1Bit
Network topology Bus topology
Communication method
Token passing (token bus)
Master-slave (only the master is available for this product)
Communication protocol MS/TP (master-slave/token passing LAN)
Maximum connection 255 (up to 32 for one segment, addition with a repeater is available)
Node number 0 to 127
Master 0 to 127 (this product is the master)
Supported property of BACnet
standard object type
Refer to page 250
Supported BIBBs (Annex K) Refer to page 258
BACnet standard device profile
(Annex L)
Refer to page 258
Segmentation Not supported
Device address binding Not supported
REMARKS
• This product conforms to BACnet Application Specific Controller (B-ASC).
• This product is designed for multiple master network, therefore 2-wire type connection is supported.
RXD
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC)
SG
(GND)
P5S
(VCC)
SG
(GND)
VCC
TXD
510
510
Other node
Connect two 510 (1/4W) resistor.