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5.3.7.2 RS485 SERIAL PORT

This section is included to give information about the currently selected serial port and external modem

(if connected).

The items displayed on this page will change depending upon configuration of the module. You are

referred to your system supplier for further details.

NOTE:

NOTE:NOTE:

NOTE:

Factory Default settings are for the RS485 port to operating at 19200 baud,

Factory Default settings are for the RS485 port to operating at 19200 baud, Factory Default settings are for the RS485 port to operating at 19200 baud,

Factory Default settings are for the RS485 port to operating at 19200 baud,

modbus slave address 10.

modbus slave address 10.modbus slave address 10.

modbus slave address 10.

Module RS485 port configured for connection to a modbus

master.

The modules operate as a modbus RTU slave device.

In a modbus system, there can be only one Master, typically a

PLC, HMI system or PC SCADA system.

This master requests for information from the modbus slave (The module) and may (in control

systems) also send request to change operating modes etc. Unless the Master makes a request, the

slave is ‘quiet’ on the data link.

The factory settings are for the module to communicate at 19200 baud, modbus slave address 10.

To use the RS485 port, ensure that ‘port usage’ is correctly set using the DSE Configuration Suite

Software.

Required settings are shown below.

‘Master inactivity timeout’ should be set to at least twice the value of the system scan time. For

example if a modbus master PLC requests data from the module once per second, the timeout should

be set to at least 2 seconds.

The DSE Modbus Gencomm document containing register mappings inside the DSE module is

available upon request from [email protected]. Email your request along with the serial

number of your DSE module to ensure the correct information is sent to you.

Typical requests (using Pseudo code)

BatteryVoltage=ReadRegister(10,0405,1)

: reads register (hex) 0405 as a single register (battery volts)

from slave address 10.

WriteRegister(10,1008,2,35701, 65535-35701)

: Puts the module into AUTO mode by writing to (hex)

opposite of auto mode)

Shutdown=(ReadRegister(10,0306,1) >> 12) & 1)

: reads (hex) 0306 and looks at bit 13 (shutdown alarm

present)

Warning=(ReadRegister(10,0306,1) >> 11) & 1)

: reads (hex) 0306 and looks at bit 12 (Warning alarm

present)

ElectricalTrip=(ReadRegister(10,0306,1) >> 10) & 1)

: reads (hex) 0306 and looks at bit 11 (Electrical

Trip alarm present)

ControlMode=ReadRegister(10,0304,2);

reads (hex) register 0304 (control mode).

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Brainboxes PX-246 Especificaciones Pagina 49

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