beautypg.com

Sensor wiring, Modbus rs-485 wiring, Sensor communica ons modbus – APG PT-503 Slave Submersible Modbus user manual User Manual

Page 5: Modbus daisy-chain wiring

background image

Rev. A, 5/13

PT-500 Submersible Pressure Sensor

5

Automation Products Group, Inc.

APG...Providing tailored solutions for measurement applications

Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • [email protected]

• Sensor Wiring

All PT-500 models will operate on 5-24 Vdc. Always use a high quality power
source that will deliver clean, stable voltage.

Modbus RS-485 Wiring

Always use shielded cable. APG recommends using twisted-pair cable for all
Modbus network wiring.

Power

Supply

Master
Device

RS-485 A

RS-485 B

Vdc

Vdc

+

-

Sensor 1

V+ V-

A B

Sensor 2

V+ V-

A B

Sensor 3

V+ V-

A B

Use Shielded Cable

120 Ohm
Terminating
Resistor

120 Ohm
Terminating
Resistor

Modbus Daisy-Chain Wiring

• Sensor Communica ons

Modbus

(RS-485)

The PT-500 u lizes standard Modbus RTU protocol (RS-485). The sensor can
only operate as a slave device. For more informa on about Modbus RTU,
please visit www.modbus.org.

With default se ngs, the sensor will transmit at: 9600 baud, 8 bits, 1 Stop Bit,
No parity
.