Data Rate; Rs485 Port Communications Modes - Control Techniques UD70 Installation Manual

3.2

Data Rate

Unidrive:
Range:
Default:
Every node on an ANSI or Modbus network must be configured to operate at the
same data rate. Set the appropraite value as shown in the table below to configure
the RS485 port data rate.
Data Rate
(bits/sec)
19200
38400
3.3

RS485 Port Communications Modes

Unidrive:
The serial communications mode selector determines the mode of operation of the
RS485 serial port, and the protocol supported. Only slave modes are described
here. (Modes 6 to 9, 11 and 12 require DPL code to control the RS485.)
3.3.1 Standard CT ANSI Protocol
Mode 1 - 4 Wire ANSI Slave Mode (Default)
Mode 5 - 2 Wire ANSI Slave Mode
The UD70 and MD29 will communicate using the Control Techniques' standard
ANSI protocol with a 4-wire or 2-wire connection. This mode allows the Unidrive or
Mentor II to communicate with standard CT software packages, such as UniSoft,
MentorSoft, SystemWise, etc.
Menu 0 parameters are not accessible through a UD70 or MD29. Refer to the
User's Guide for MD29 or UD70 for a detailed description of the ANSI protocol.
3.3.2 Modbus RTU
Mode 13 - 4 Wire Modbus RTU Slave Mode
Mode 15 - 2 Wire Modbus RTU Slave Mode
The UD70 and MD29 will communicate using the Modicon Modbus RTU protocol
with a 4-wire or 2-wire connection. The data frame used for Modbus RTU is 1 start
bit, 8 data bits, no parity, 2 stop bits. (Even parity with 1 stop bit is NOT currently
supported.)
The following MOdbus RTU commands are supported:
FC3
FC6
FC16
The maximum number of registers that can be transferred on a single message is
limited to 20, and the range of allowed node addresses is limited from 1 to 99.
UD70/MD29 Installation Guide
Issue Number: 3
#17.07
300 to 38400 bits per second
4800
Unidrive
300 300
600 600
1200 1200
2400 2400
4800 4800
9600 9600
19200
38400
#17.06
PRESET SINGLE REGISTER
PRESET MULTIPLE REGISTERS
READ MULTIPLE REGISTERS
www.controltechniques.com
Mentor II: #14.03
Mentor II
3
6
12
24
48
96
192
38
Mentor II: #14.02
10