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Table of Contents

485SDA103798 Manual

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 434-7094

Set Turn-around Delay Command ............................... 17
Read Module Configuration Command........................ 17

Chapter 4 - A/D .......................................................19

Sampling Rate ............................................................. 19
A/D Input Range .......................................................... 19
Reference Inputs ......................................................... 19
Data Range ................................................................. 20
Converting Data........................................................... 20

Chapter 5 - Software ..............................................22

Read A/D Command ................................................... 22
Read Digital I/O Command.......................................... 23
Set Digital Output States ............................................. 24
Set Module Address .................................................... 25
Set Power-up States Command .................................. 26
Set Turn-around Delay ................................................ 27
Read Module Configuration ......................................... 28

Appendix A: Adding Data Field Confirmation.... A-1

Appendix B: Analog Input Impedance................ B-1

Appendix C: Decimal to HEX to ASCII Table .... C-1

Figures

FIGURE 1.1 - 485SDA10 UNIT ...................................................................... 1
FIGURE 1.2 - GENERAL BLOCK DIAGRAM ............................................... 2
FIGURE 1.3 - A/D WITH VARIABLE RESISTOR ......................................... 4
FIGURE 2.1 - TYPICAL 0-5V A/D CONNECTION ....................................... 7
FIGURE 2.2 - TYPICAL DIGITAL I/O CONNECTIONS ............................... 9
FIGURE 4.1 - A/D CONVERTER DATA RANGE........................................ 20
FIGURE B-1 - EQUIVALENT INPUT CIRCUIT INCL/DRIVING SOURCEB-3

Tables

TABLE 2.1 - 485SDA10 I/O PORT PINOUT ...................................... 8
TABLE 2.2 - RS-485 TERMINAL BLOCK CONNECTIONS .......... 10
TABLE 3.1 - 485SDA10 COMMANDS ............................................. 12
TABLE 3.2 - EQUIVALENT VALUES ............................................. 13
TABLE 3.3 - READ A/D RESPONSE................................................ 14
TABLE 3.4 - READ DIGITAL I/O RESPONSE FOR OUTPUTS..... 15
TABLE 3.5 - READ DIGITAL I/O RESPONSE FOR INPUTS......... 15
TABLE 3.6 - SET DIGITAL OUTPUT DATA BYTE VALUES ...... 16