B&B Electronics Switch RS-485 Manuel D’Utilisation

12

485SDA103798 Manual

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.

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

!0RD

Hex

<21><30><52><44>

Decimal

(33)(48)(82)(68)

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.