Figure 5. Simplified Functional Diagram; Communication Configuration; Distributed Smart Switch Commands - B&B Electronics 485DSS User Manual

B&b electronics distributed smart switch user manual

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Figure 5. Simplified Functional Diagram

Three red LED indicators are located on top of the 485DSS.

The LED labeled TD flashes when the RS-232 device is transmitting

data. The LED labeled RD flashes when data is being received by

the 485DSS from the RS-485 network. The LED labeled SEL turns

on indicating that the RS-232 device has access to the RS-485

network. Refer to Figure 2. Terminal blocks on the 485DSS

connect the RS-485 signals, and input power to the unit. The RS-

232 DTE signals of the 485DSS connect to a DB25 male connector.

An eight-position switch located in the top center of the 485DSS sets

the 485DSS's unique address.

Before the HOST can communicate with a 485DSS, the

HOST must set its communication format to: 9600 baud, 8 data bits,

no parity, and 1 stop bit. After communicating with the 485DSS, the

HOST can reset its communication format to match the format of the

RS-232 device attached to the 485DSS. ALL data is passed through

the unit after it has been selected. The 485DSS does not have any

buffering.

The 485DSS constantly monitors the serial data received on the

RS-485/422 port for a command string. There are only three

commands required to control the 485DSS: the ON command, the

OFF command, and the status request command.

485DSS-0308 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445

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