Emerson Control Techniques Epsilon Eb Series Reference Manual page 133

Epsilon Eb and EN Drives Reference Manual
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
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 90: EN Multi-Drop Wiring Diagram
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Serial Communications Specifications
Start bit
Stop bit
Parity
Data
TIA-XXX
Serial Cable
TERM-H
DDS-XXX DDS-XXX
Serial Cables Serial Cables
19.2k
1
2
none
8
TERM-T