Modbus Connections; Optional Keyswitch And Manual Start/Stop Button - Kohler KD700 Operation

1.3.2

Modbus Connections

Use RS-485 cable for Modbus RTU connections. Belden #9841 or equivalent shielded, twisted-pair cable is recommended. See
Figure 5. See the generator set wiring diagram for the Modbus connection location on TB10.
The controller also supports Modbus TCP over Ethernet. Connect to the RJ45 port labeled Ethernet 3 on the controller's base
module.
The controller communicates using Modbus
controller seeks the system and alternator parameters and diagnostic information then responds back to the Modbus
Note:
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Only one Modbus master can be connected to the controller. Examples include the remote serial annunciator and switchgear
applications.
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Figure 5 Modbus Connections
1.3.3

Optional Keyswitch and Manual Start/Stop Button

Some controllers are equipped with the optional keyswitch and manual start/stop button shown in Figure 6. See the Controller
Features Section for the location on the controller assembly.
Figure 6 Optional Keyswitch and Manual Start/Stop Button
Keyswitch. The keyswitch disables the mode pushbutton on the controller touchscreen. The touchscreen will display the
operation mode, but the mode cannot be changed using the touchscreen if the controller is equipped with the keyswitch. The
keyswitch positions are described in Figure 7. See the Controller Operation Modes section for more information on controller
operation modes.
Manual Start/Stop Button. When the keyswitch is in the Manual position, pressing the Start/Stop button will start and stop the
generator set.
Note:
Pressing the manual stop button shuts down the generator set immediately, without running the engine cooldown cycle. Running
the generator set without load for 5 minutes before stopping manually is recommended.
Position
Manual Allows generator set start and stop using the manual pushbutton.
Off Places the generator set in OFF/Out of Service mode. The generator set will not start, even if a remote start command is
received or the Start button is pressed.
Auto Automatic operation allows a remote switch or automatic transfer switch to start and stop the generator set.
Figure 7 Keyswitch Positions
18
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as a slave connection with the Modbus
up to 1220 m (4000 ft.)
Generator Set
Controller
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RS-485
Modbus
Description
master initiating the communication. The
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Master
TP-7070
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master.
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