Emerson Control Techniques EN Series Installation Manual page 50

Modbus Communications
The drive's serial communication protocol is Modbus RTU slave with a 32 bit data extension.
The Modbus protocol is available on most operator interface panels and PLC's.
Max baud rate
Start bit
Stop bit
Parity
Data
Control Techniques' Motion Interface panels are supplied with a Modbus master
communications driver.
Multi-Drop Communications
The RS-485 option (pins 4 and 9) is provided for multi-drop configurations of up to 32 drives.
Control Techniques provides a special multi-drop serial cable which allows you to easily
connect two or more drives.
Note:
The terminating resistor packs, TERM-H
and TERM-T, should be installed on the
first (TERM-H) and last (TERM-T) drive in
the string if the total cable length is over
50 feet.
Figure 32: EN Multi-Drop Wiring Diagram
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Serial Communications Specifications
TIA-XXX
Serial Cable
TERM-H
DDS-XXX DDS-XXX
Serial Cables Serial Cables
Installation
19.2k
1
2
none
8
TERM-T
33