B&B Electronics RS-485 manual A/D with Variable Resistor

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variable resistor must be greater than 1k Ohms to limit the output current to 5mA.

∙Connect A/D Ref Input+ to +5V DC.

∙Connect A/D Ref Input- to analog ground (See Figure 1.3).

∙Connect the 485SDA10 to an RS-422 or 4-wire RS-485 serial

port.

Once your connections have been made, run the demo program. Any change in A/D or digital lines on the 485SDA10 will automatically be displayed on the screen.

Figure 1.3 - A/D with Variable Resistor

4

485SDA103798 Manual

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

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

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Contents
Internet Electronics Mfg. Co. IncDesigned and Manufactured Ottawa, Illinois Table of Contents Software Tables485SDA103798 Manual Table of Contents Iii 485SDA10 Features 485SDA10 UnitSoftware Installation Packing ListUninstall Getting StartedWindows Windows 9x and Windows NTA/D with Variable Resistor 485SDA10 Specifications Inputs #0-10 Ref Input +Typical Connections Ref InputAnalog Ground Digital I/O Connections 485SDA10 I/O Port PinoutDigital Inputs #0-2 Digital Outputs #0-2Digital Ground Typical Digital I/O ConnectionsSerial Port Connections RS-485 Terminal Block ConnectionsPower Supply Connections Typical RS-485 2-wire ConnectionCommands 485SDA10 CommandsEquivalent Values Reading A/D Channels CommandSyntax Read A/D Response AddrRA#Ch#MSBch#LSBch#-1MSB...ch0MSBch0LSB Reading Digital I/O Command AddrRDStates Read Digital I/O Response for OutputsSet Digital Output Command Set Module Address CommandAddrSOstates Set Digital Output Data Byte ValuesRead Module Configuration Command Set Power-up States CommandSet Turn-around Delay Command Addressstatesdelay Reference Inputs Sampling RateInput Range Data Range Converting DataPage Read A/D Command Command$ = ! + CHR$addr + RA + CHR$channelPrint #1, Command$ MSB$ = INPUT$1, #1 LSB$ = INPUT$1, #1Reply$ = INPUT$ 1, #1 Read Digital I/O CommandCommand$ = ! + CHR$addr + RD Set Digital Output States Digital I/O Mask ValuesCommand$ = !0SO + CHR$states Command$ = ! + CHR$addr + SO + CHR$newaddrSet Module Address Addr =States = states and NOTmask Addr = 5 states =Set Turn-around Delay Command$ = ! + CHR$addr + SC + CHR$delayRead Module Configuration Comp = not x and &HFF #addrRA00FF00FF01FE Table A-1 Extended Commands Appendix B Analog Input Impedance Simplified Analog Input Analysis 1 2 LSB = R s + 1k Ω × 60pF × ln2048485SDA103798 Manual Appendix B Appendix C Decimal to HEX to Ascii Table Table C-1 Decimal to HEX to Ascii TableClass a Equipment
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