B&B Electronics RS-485 manual 485SDA10 Commands

Chapter 3 - Commands

There are only three commands required to control the 485SDA10:

∙Read A/D command

∙Read digital I/O command

∙Set output states command

There are four commands used to configure the module:

∙Set power-up states command

∙Set turn-around delay command

∙Set module address command

∙Read module configuration command

The command string consists of four bytes. Some commands require an additional data byte. For information on adding data field confirmation to the data fields refer to Appendix A. See Table 3.1.

Table 3.1 - 485SDA10 Commands

Function	Command	Response
Read A/D Channels	!{addr}RA{#}	{ch#msb}{ch#lsb}
		{ch(#-1)msb}...
		{ch0msb}{ch0lsb}
Read Digital I/O	!{addr}RD	{I/O states}
Set Output States	!{addr}SO{#}	no response
Set Module Address	!{addr}SA{new addr}	no response
Set Power-up States	!{addr}SS{#}	no response
Set Turn-around Delay	!{addr}SC{#}	no response
Read Configuration	!{addr}RC	{addr}{powerup
		states}{turn-around
		delay}

NOTE: Each {...} represents one byte.

Before going into the specifics of each command, it is important to understand that a byte has a value from 0 to 255 and can be represented in decimal (0 to 255), hexadecimal (00 to FF), or by an ASCII character. The commands in Table 3.1 are shown in ASCII, for example:

ASCII	Hex	Decimal
!0RD	<21><30><52><44>	(33)(48)(82)(68)
12		485SDA103798 Manual

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