TP-7126 5/20
35
Section 1 Specifications
1.8.2
Communication Setup Submenu
Modbus
r
Communications
The controller communicates using Modbus
r
as a slave
connection with the Modbus
r
master initiating the
communication. The controller seeks the system and
alternator parameters and diagnostic information then
responds back to the Modbus
r
master. In addition, the
controller accepts information to alter controller
parameters including generator set starting and
stopping. See Figure 1-9. Refer to the List of Related
Materials for available Modbus
r
literature.
Note:
Only one Modbus
r
master can be connected to
the controller. Examples include the remote
serial annunciator, monitoring software, and
switchgear applications.
Generator Set
Controller
Modbus
r
Master
RS-232
up to 15 m (50 ft.)
RS-485
up to 1220 m (4000 ft.)
Figure 1-9
Modbus
r
Connections
A controller can communicate directly to a Modbus
r
master or participate in a network of devices. It can also
be used to interface a local master to a network of
devices.
The Modbus
r
master polls slave devices for data.
Controller devices are slaves. Examples of master
devices are a personal computer running monitoring
software and the remote serial annunciator.
SiteTech
Group
Parameter
Setting
Modbus Address
Use a unique network address
between 1 and 247 for each unit.
Use 1 for a single connection.
Do not use 0 (zero).
Baud rate 9600, 19200, 38400, or 57600.
Must match the master PC and all
devices in the system.
Figure 1-10
Decision-Maker
r
3500 Communication
Parameters
Select the baud rate. Choose the same baud rate for the
Modbus
r
master, modems, and connected devices.
See Figure 1-10.
Each generator set controller must have a unique
Modbus
r
address and PGEN node number (1- 4).
Note:
The PGEN node number is automatically
determined. The number of nodes online should
match the number of installed generators.
Note:
The PGEN baud rate should not be adjusted
except under direction from a factory service
representative. Different baud rates between
controllers on the network will result in a loss of
communication on the network.
Modbus
r
is a registered trademark of Schneider Electric.
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