Chapter 4. Serial Communications
116
PanaFlow™ MV80, MV82 & MV84 User’s Manual
4.3
BACnet MS/TP Communications
4.3.1
BACnet MS/TP Description
The BACnet Master-Slave/Token-Passing (MSTP) driver implements a data link protocol that uses the services of the
RS-485 physical layer. The MS/TP bus is based on BACnet standard protocol SSPC-135, Clause 9. BACnet MS/TP
protocol is a peer-to-peer, multiple master protocols based on token passing. Only master devices can receive the
token, and only the device holding the token is allowed to originate a message on the bus. The token is passed from
master device to master device using a small message. The token is passed in consecutive order starting with the
lowest address. Slave devices on the bus only communicate on the bus when responding to a data request from a
master device.
4.3.2
Baud Rates on the MS/TP Bus
An MS/TP bus can be configured to communicate at one of four different baud rates. It is very important that all of
the devices on an MS/TP bus communicate at the same baud rate. The baud rate setting determines the rate at
which devices communicate data over the bus. The baud rate settings available on MV80 and MV 82 Vortex Mass
Flow Meters are 9600, 19200 and 38400.
4.3.3
Baud Rate and MAC Address Configuration
1.
Power on the IUT.
2.
Press
Enter
to go to the configuration menu.
3.
Give the factory password
16363
(use Up and Down arrows to enter the digits).
4.
Navigate to the Diagnostics menu.
5.
Press
Enter
and press the right button immediately.
6.
Navigate to the Config Code screen by continuously pressing the down button.
7.
After reaching the Config Code screen, press the right button to navigate to the Comm. Type screen.
8.
Change the Comm. Type to “BACnet” and press
Enter
.
Note:
Modbus will enable Baud Rate and MAC address screens.
9.
Press
Exit
twice to return to the Diagnostics Menu.
10.
Navigate to the Output menu by using the right or left arrow buttons.
11.
Press the down button until you reach the Baud Rate and MAC address screens.
12.
Change the required settings and press the
Exit
and
Enter
buttons to save the configuration.
13.
Reboot the device by powering it off and on.
Note:
a. IUT supports 9600, 19200, 38400 baud rates.
b. MAC address range is 0-127.
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