Orion System PT-Link II BACnet3 - Manual (Page 7)

PT-Link II BACnet3 Interface
2. QUICK PT-LINK SET-UP
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2.3 Confi guring the PT-Link DIP Switches
The DIP Switches allow you to set the protocol between BACnet MS/TP
and BACnet IP, set the BACnet MS/TP Baud Rate, and set the BACnet
MS/TP MAC address, and set the BACnet MS/TP device instance. You
can obtain the MAC address, Device Instance, and baud rate from your
Building Automation System (BAS) Integrator. The DIP Switches are
shown in Figure 3.
NOTE: You must cycle power after making changes to the DIP
Switch Settings for the settings to take effect.
2.3.1 Set the BACnet MS/TP Baud Rate
“B” bank DIP switches B1 – B4 is used to set the BACnet MS/TP baud
rate of the PT-Link. This matches the baud rate required by the Building
Management System for BACnet MS/TP.
FFP-485
DIP
Switch
Bank A
DIP
Switch
Bank B
Figure 3: DIP Switches
Using B1 – B4 to Set Baud Rate
Baud B1 B2 B3 B4
9600 ON ON ON ON
19200 OFF OFF OFF ON
38400 ON ON OFF ON
57600 OFF OFF ON ON
76800 ON OFF ON ON
Table 2: Baud Rate Settings
2.3.2 Set the BACnet MS/TP MAC Address
1. Only (1) MAC address is set for the PT-Link regardless of how
many devices are connected to it.
2. Set the BACnet MS/TP MAC addresses of the PT-Link to a value
between 1 and 127 (MAC Master Addresses). This is so that the BMS
Front End can fi nd the PT-Link via the BACnet auto discovery func-
tion. MAC addresses from 128 to 255 cannot be auto discovered by
the BMS Front End.
3. Set “A” bank DIP switches A1 – A7 to assign a MAC Address to
the PT-Link for BACnet MS/TP. Please refer to Section 9, page 67
for the complete range of MAC Addresses and DIP switch settings.
NOTE:
The BACnet Device’s Instance is generated by adding
the MAC address to the Node Offset, which defaults to
50,000. If the Device Instance must be set to something
other than in the range of 50,001 to 50,127, see Section
3.3.2, page 12 to change the Node Offset value.
CAUTION:
DIP Switch 8 in Bank A must always remain off
for proper operation.