Kohler 20-3250 kW manual Modbus Communications, Remote Single Connection, Remote Area Network

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.

				Generator Set
		Modem	Modem	Controller or
				Transfer Switch
				Control
	RS-232			RS-232
Personal	up to	Telephone		up to
Computer	15 m (50 ft.)	Lines		15 m (50 ft.)

Figure 2-14 Remote Single Connection

				Generator Set	Generator Set
				Controller or	Controller or
				Transfer Switch	Transfer Switch
				Control	Control
Modem		Modem	RS-232 to RS-485
			port converter
			RS-485	Generator Set	Generator Set
Personal	Telephone		up to 1220 m	Controller or	Controller or
Computer	Lines		(4000 ft.)	Transfer Switch	Transfer Switch
				Control	Control

Figure 2-15 Remote Area Network

2.6.2Modbus 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.

RS-485
up to 1220 m (4000 ft.)
Generator Set	Modbusr Master
Controller
RS-232
up to 15 m (50 ft.)
Figure 2-16 Modbusr Connections

Note: Only one Modbusr master can be connected to the 550 controller. Examples include the remote serial annunciator, Monitor III, and switchgear applications.

Modbusr is a registered trademark of Schneider Electric.

TP-6200 10/12 Section 2 Operation 51