Filter
Top Products
TP-6200 10/12 51Section 2 Operation
Remote Single Connection
A modem connects a PC to a single device. The PC
communicates with the device via a telephone network.
Locate the PC anywhere a telephone line is available.
See Figure 2-14.
Remote Area Network
A PC connects to a modem. The devices connect to a
LAN network. The PC communicates to the devices via
a telephone network that is interfaced to the LAN
network. Acceptable devices include the Decision-
Makerr 550 controller, Decision-Makerr 340 controller,
M340 transfer switch control, M340+ transfer switch
control, and PM340 power monitor. Locate the PC
anywhere a telephone line is available. See
Figure 2-15.
The 550 controller can be used as an RS-232 to RS-485
port converter in a LAN network if the 550 controller is
located within 15 m (50 ft.) of the device modem. This
configuration is the Remote LAN Conv option.
Personal
Computer
Telephone
Lines
ModemModem
Generator Set
Controller or
Transfer Switch
Control
RS-232
up to
15 m (50 ft.)
RS-232
up to
15 m (50 ft.)
Figure 2-14 Remote Single Connection
Generator Set
Controller or
Transfer Switch
Control
RS-232 to RS-485
port converter
Personal
Computer
Telephone
Lines
Modem
Modem
Generator Set
Controller or
Transfer Switch
Control
Generator Set
Controller or
Transfer Switch
Control
Generator Set
Controller or
Transfer Switch
Control
RS-485
up to 1220 m
(4000 ft.)
Figure 2-15 Remote Area Network
2.6.2 Modbus Communications
The controller communicates using Modbusr as a slave
connection with the Modbusr master initiating the
communication. The controller seeks the system and
alternator parameters and diagnostic information then
responds back to the Modbusr master. In addition, the
controller accepts information to alter controller
parameters including generator set starting and
stopping. See Figure 2-16. Refer to the List of Related
Materials for available Modbusr literature.
Note: Only one Modbusr master can be connected to
the 550 controller. Examples include the remote
serial annunciator, Monitor III, and switchgear
applications.
Generator Set
Controller
Modbusr Master
RS-232
up to 15 m (50 ft.)
RS-485
up to 1220 m (4000 ft.)
Figure 2-16 Modbusr Connections
Modbusr is a registered trademark of Schneider Electric.