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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
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,
The 550 controller can be used as an
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| Generator Set |
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| Modem | Modem | Controller or |
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| Transfer Switch | ||
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| Control |
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Personal | up to | Telephone |
| up to |
Computer | 15 m (50 ft.) | Lines |
| 15 m (50 ft.) |
Figure 2-14 Remote Single Connection
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| Generator Set | Generator Set |
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| Controller or | Controller or |
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| Transfer Switch | Transfer Switch |
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| Control | Control |
Modem |
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| port converter |
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| Generator Set | Generator Set | |
Personal | Telephone |
| up to 1220 m | Controller or | Controller or |
Computer | Lines |
| (4000 ft.) | Transfer Switch | Transfer Switch |
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| 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
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up to 1220 m (4000 ft.) |
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Generator Set | Modbusr Master | |
Controller | ||
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up to 15 m (50 ft.) |
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Figure |
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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.
| Section 2 Operation 51 |