VorTek Pro-T, Instruction Manual

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Series M22/M23/M24 Instruction Manual Chapter 4 Serial Communications
M-000-00010 4-19
BACnet MS/TP Communications
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.
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 Pro-
V™ Vortex
Mass Flow Meters are 9600, 19200 and 38400.
2.1. Baud Rate and MAC address configuration
1. Power on the IUT
2. Press Enter to go to the configuration menu
3. Enter the factory password 16363 (Use Up and Down arrows to enter
the digits)
4. Navigate with the left arrow to Diagnostics menu
5. Press Enter and press right button immediately
6. Navigate to Config Code screen by continuous pressing down button
7. After reaching config code screen, press right to navigate to Comm.
Type screen
8. Change the comm. Type to “ BACnet ” and press Enter
Note: BACnet will enable Baud Rate and MAC address screens
9. Press Exit twice to go back to the Diagnostics menu
10. Navigate to Output Menu by using right or left arrow buttons
11. Press Down button and reach Baud Rate and MAC address screens