B&B Electronics 485DSS manual

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response from an individual 485DSS. Placing broadcast characters in the address field specifies all 485DSS's on the network. This command temporarily turns off (disconnect) the RS-232 port from the network while transmitting the reply message.

The reply message transmitted by the 485DSS consists of six ASCII characters. The first character is the acknowledge character, an upper case "A" (decimal 65). The second and third characters represent the hexadecimal address of the 485DSS that sent the message. The address range is from 0 to 255 (HEX "00" to "FF"). The fourth character indicates the select state of 485DSS, a "0" (decimal 48) indicates the RS-232 port does not have a connection (not selected) to the network and a "1" (decimal 49) indicates the RS-232 port has a connection (selected) to the network. The fifth character indicates the state of the CTS handshake input line on pin 5 of the RS-232 port connector. A "0" (decimal 48) indicates a low state on the CTS input pin, and a "1" (decimal 49) indicates a high state on the CTS input pin. The sixth character is the end of message character, a carriage return (decimal 13).

Reply Syntax: A ___ ___ ___ ___ cr

End of message char.

Handshake input state.

Select State.

Least signf. address character.

Most signf. address character.

Start of message character.

When this command contains a specific address, the 485DSS whose address matches the command address will wait for twenty milliseconds before transmitting the reply message. If the command uses the broadcast characters to receive status from all 485DSS's on the network each 485DSS will delay transmitting its reply based on its address. The amount of delay is equal to the unit's address in decimal multiplied by twenty milliseconds then add an additional 20 milliseconds.

12485DSS-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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Contents Electronics Mfg. Co. Inc Designed and Manufactured Ottawa, IllinoisInternet 485DSS-0308 Manual CoverPage Table of Contents IiTable of Contents 485DSS-0308 Manual Checklist Hardware IntroductionPort Configuration SpecificationsRS-485/422 Port Signal Ground +12VDC Power Supply Input RS-422/485 Port Terminal Block Signal Description DirectionRS-232 Port Clear to Send Input Signal Ground RS-422/485 WiringWire Mode Frame Ground Transmit Data Output Receive Data InputComponent Values For Send Data Timing RS-485 Wiring Diagram Wire Mode Power Supply RS-422 Wiring Diagram RS-485 and RS-422 TerminationOperation Communication Configuration Distributed Smart Switch CommandsCommand String On CommandDecimal HexOFF Command Status Request CommandPage ACK Address Switch Setting the 485DSS AddressDIP Switch Binary File Transfer Software Description Appendix a Ascii Character Codes 485DSS-0308 Manual Appendix aPage Symbol Appendix B Decimal/Hexadecimal/ConversionsDec/Hex Conversions Decimal Hexadecimal 485DSS-0308 Manual Appendix BHexadecimal to Decimal Conversion Decimal to Hexadecimal ConversionAppendix C Cable Charts Chart 1. IBM PC DB25 Connector to 485DSS RS-232 DTE PortRS-232 DTE Port DB25 Connector Direction RS-232 DTE PortRS-485/422 Chart 6. RS-485 2-Wire Device to 485DSS RS-485/422 PortDevice Direction Terminal Blocks
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