RS-485 Connections, Loop Topology | Multi-Tech Systems 7600, 7500

RS-485 Connections	ION 7500 / ION 7600 User’s Guide

RS-485 Connections

Refer to the “Hardware Reference” chapter for the ION 7500 and ION 7600 meters’

RS-485 specifications.

RS-485 connections are made via the captured-wire connectors on the rear of the meter. Up to 32 devices can be connected on a single RS-485 bus. Use a good quality shielded twisted pair cable for each RS-485 bus, AWG 22 (0.5 mm2) or larger. The overall length of the RS-485 cable connecting all devices cannot exceed 4000 ft. (1219 m). The RS-485 bus may be configured in straight-line or loop topologies.

Straight-Line Topology

RS-485

COM

SH + -

RS-232 to	+
RS-485	-
Converter	SHLD

SHLD		SHLD		SHLD	Termination
					Termination
					RT Resistor
SHLD	+	SHLD	+	SHLD	+

Loop Topology

RS-485

COM

SH + -

	RS-232 to	+
	RS-485
		-
	Converter
		SHLD

SHLD	SHLD	SHLD	SHLD Termination
			Block
SHLD	SHLD	SHLD

General Bus Wiring Considerations

Devices connected on the bus, including the meter, converter(s) and other instrumentation, must be wired as follows:

Connect the shield of each segment of the cable to ground at one end only.

Isolate cables as much as possible from sources of electrical noise.

Use an intermediate terminal strip to connect each device to the bus. This allows for easy removal of a device for servicing if necessary.

Install a ¼ Watt termination resistor (RT) between the (+) and (-) terminals of the device at each end point of a straight-line bus. The resistor should match the nominal impedance of the RS-485 cable (typically 120 ohms – consult the manufacturer’s documentation for the cable’s impedance value).

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Chapter 5 - Features and Applications

7500, 7600 specifications

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Multi-Tech Systems 7600 RS-485 Connections, General Bus Wiring Considerations, Loop Topology

Models: 7500 7600