Table of Contents
Advertisement
Programming
Communication
RS485 COM Port Configuration
The RS485 is very simple to configure .
1 . Select the communications type: Modbus or BACnet .
1 . Choose the BAUD Rate: Auto, 300, 1200, 2400, 9600, 19200, 38400, or 76800 to match the rest of the devices on the
network . The factory default of 9600 is recommended for most systems . The lower the baud rates have greater stability,
and greater tolerance of wiring and other hardware issues .
Configuring the Modbus or BACnet are described in the following sections .
Modbus
•
Network:
RS485
•
Baud Rate:
Selectable
•
Protocol:
RTU or ASCII
•
Addresses:
001 to 247
•
Slave only
•
Read Input
Registers:
30001...39999 (Function "04")
•
Data Type:
IEEE 754 Float (ABCD – CDAB)
Each variable is stored in two Modbus registers; lowest byte in the first and highest in the second .
Only the variable value is transmitted .
The associated units of measure must be manually configured in the receiving Modbus device .
1
Flow 1 Rate
2
Flow 2 Rate
3
Flow 1 Total
4
Flow 2 Total
Modbus uses the following:
Data Bits = 8
Stop Bits = 1
Parity = None
Page 24
(Input Register 30002 + 30003)
(Input Register 30004 + 30005)
(Input Register 30006 + 30007)
(Input Register 30008 + 30009)
CTL-UM-01026-EN-05
October 2017
Advertisement
Table of Contents
