B&B Electronics RS-485 manual Ref Input, Analog Ground, Typical Connections

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A/D Ref Input -

The voltage connected to this pin determines the low end of the input voltage range. For proper operation, this pin must be connected to a DC voltage between 0 and +2.5 Volts. Typically, this is connected to your device’s ground and analog ground (0V).

Analog Ground

This pin should be connected to your analog device’s ground. If ground (0V) is the low end of your input voltage range,

A/D Ref Input- should be connected to this pin. To minimize noise, do not connect analog ground and digital ground together. Connect unused A/D inputs to analog ground.

Typical Connections

Figure 2.1 shows the typical connections of the 485SDA10 for a 0 to 5V DC input range.

Figure 2.1 - Typical 0-5V A/D Connection

485SDA103798 Manual

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

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Contents Internet Electronics Mfg. Co. IncDesigned and Manufactured Ottawa, Illinois Table of Contents Tables Software485SDA103798 Manual Table of Contents Iii 485SDA10 Unit 485SDA10 FeaturesPacking List Software InstallationWindows 9x and Windows NT UninstallGetting Started WindowsA/D with Variable Resistor 485SDA10 Specifications Ref Input + Inputs #0-10Typical Connections Ref InputAnalog Ground Digital Outputs #0-2 Digital I/O Connections485SDA10 I/O Port Pinout Digital Inputs #0-2Typical Digital I/O Connections Digital GroundRS-485 Terminal Block Connections Serial Port ConnectionsTypical RS-485 2-wire Connection Power Supply Connections485SDA10 Commands CommandsEquivalent Values Reading A/D Channels CommandSyntax Read A/D Response AddrRA#Ch#MSBch#LSBch#-1MSB...ch0MSBch0LSB Read Digital I/O Response for Outputs Reading Digital I/O CommandAddrRD StatesSet Digital Output Data Byte Values Set Digital Output CommandSet Module Address Command AddrSOstatesRead Module Configuration Command Set Power-up States CommandSet Turn-around Delay Command Addressstatesdelay Reference Inputs Sampling RateInput Range Converting Data Data RangePage MSB$ = INPUT$1, #1 LSB$ = INPUT$1, #1 Read A/D CommandCommand$ = ! + CHR$addr + RA + CHR$channel Print #1, Command$Reply$ = INPUT$ 1, #1 Read Digital I/O CommandCommand$ = ! + CHR$addr + RD Digital I/O Mask Values Set Digital Output StatesAddr = Command$ = !0SO + CHR$statesCommand$ = ! + CHR$addr + SO + CHR$newaddr Set Module AddressAddr = 5 states = States = states and NOTmaskCommand$ = ! + CHR$addr + SC + CHR$delay Set Turn-around DelayRead Module Configuration Comp = not x and &HFF #addrRA00FF00FF01FE Table A-1 Extended Commands Appendix B Analog Input Impedance 1 2 LSB = R s + 1k Ω × 60pF × ln2048 Simplified Analog Input Analysis485SDA103798 Manual Appendix B Table C-1 Decimal to HEX to Ascii Table Appendix C Decimal to HEX to Ascii TableClass a Equipment

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RS-485 specifications

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