Western Reserve Controls 1782-JDC Manual de usuario descargar pdf (Pagina 16)

Western Reserve Controls 1782-JDM User’s Manual

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3.3 RS232/RS485 Connector

Your Modbus device(s) are connected to the JDM via 3-wire communications cable. See your Modbus

device User Manual for details on the specific connection.

Table 3-3 Serial Port Connections

Pin # RS232

Signal

RS485

Signal

Designator

1 Transmit Signal + SIG+

2 Receive Signal - SIG-

3 Ground Ground GND

3.4 Power Requirements

3.4.1 Device power

The JDM is powered directly from the DeviceNet connection 11-25 Vdc power supply. The JDM consumes

90 mA of current at 24 Vdc, or ~2 Watts, typical.

3.5 Network Configuration

DeviceNet specifications provide for a maximum network distances for the main trunk line and drop

lines, depending upon the baud rate used on the network. They are:

Table 3-4 Network Maximum Lengths

Trunk Line Length Drop Length

Maximum Distance Maximum Cumulative

Baud Rate

Meters Feet Meters Feet Meters Feet

125k baud 5OO m 164O ft 6 m 2O ft 156 m 512 ft.

25Ok baud 25O m 82O ft 6 m 2O ft 78 m 256 ft.

5OOk baud 1OO m 328 ft 6 m 2O ft 39 m 128 ft.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 25 26

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Western Reserve Controls 1782-JDC Manual de usuario Pagina 16