5 - APM403 Communication (DEC2017) [PDF]

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a. RTU (RS485)

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MODBUS : RTU

Connection via RS485 The wiring of the RS485 communication should be provided in such a way that the following rules are observed:

• Standard maximum link length is 1000 m. • Shielded cable2 has to be used, shielding has to be connected to the terminal T01 (BATT -).

• External units can be connected on the RS485 line in any order, but keeping line arrangement (no tails, no star) is necessary. • The line has to be terminated by 120 Ohm resistors at both ends.

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MODBUS : RTU Connection via RS485

RS485 wiring for shorter distances

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MODBUS : RTU

Connection via RS485

RS485 wiring for longer distances

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MODBUS : RTU

APM403 Configuration

Serial Parameters

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MODBUS RTU : Test Communication

MODBUS DOCTOR RTU Type Serial Parameters

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MODBUS RTU : Test Communication

MODBUS Table

MODBUS Address Variable Name

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Generate MODBUS Table

Length : 2 Bytes (16 Bits)

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MODBUS RTU : Test Communication Read

MODBUS DOCTOR Connection

Register Read Result : Battery Volt

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MODBUS RTU : Test Communication Write

MODBUS DOCTOR

Controller Mode

List#10

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MODBUS RTU : Test Communication Write

MODBUS DOCTOR

List#10 Mode

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MODBUS RTU : Test Communication Write

Password Register

Password Register Access Code Write

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MODBUS RTU : Test Communication Write

Put Controller in Test Mode

Register Test Mode Write

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b. Ethernet

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MODBUS : Ethernet

R S 4 8 5

Ethernet Cable

IP : 192.168.0.4

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IP : 192.168.0.3

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MODBUS : Ethernet

Fixed Controller IP Address IP Mask

Enabled Modbus Server

Ethernet : IP Configuration (Computer) Network and sharing center :

1. Ethernet

3. Internet protocol V4 (TCP/IPV4)

2. Properties

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Ethernet : IP Configuration (Computer)

IP Address Mask

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MODBUS : MODBUS Configuration

Reading

Controller IP Address Communication Port MODBUS : 502 Connection Battery Voltage

MODBUS : Read

Reading

Controller IP Address Communication Port MODBUS : 502 Connection Battery Voltage