Technical Instructions
Modbus RTU Interface Module for SED2
Document Number 155-767
February 25, 2009
Page 2
Siemens Industry, Inc.
Warning/Caution Notations
WARNING:
Personal injury/loss of life may occur if you do not
perform a procedure as specified.
CAUTION:
Equipment damage, or loss of data may occur if
you do not follow procedure as specified
Hardware Setup
Power Supply
Power may be supplied by either connecting the configuration kit power supply to one side of
the unit,
or
by providing regulated 6 to 28 Vdc power to pin 9 of the local serial port from the
SED2. See Figure 2.
WARNING:
Do not connect the external 9 Vdc power supply and pin 9
of the LOCAL cable at the same time.
Programming Switch
The Programming (PRG) Switch on the Interface Module, should always be in the RUN
position (up) for normal operations and configuration.
The PRG position is used strictly for loading firmware at the factory.
The Interface Module comes with two serial ports. See Figure 2.
The LOCAL port is for connection to a SED2 and supports both RS232 and RS485 (2-wire
and ground) communications. The LOCAL port is also used for configuration and
programming of the Interface Module.
The NETWORK port is for connection to a network and supports RS485 (2-wire)
communications.
Figure 2. Interface Module Hardware.
