Acces I/O products RDAG12-8 User Manual
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Contents
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Chapter 1: IntroductionFeatures• Remote Intelligent Analog Output and Digital I/O Units with Opto-Isolated RS485 SerialInterface to Host Computer• Eight 12-Bit Analog Current Sinks (4-20mA) and Voltage Outputs• Software Selectable Voltage Ranges of 0-5V, 0-10V, ±5V• Low-Power and High-Power Analog Output Models• Seven Bits of Digital I/O Configured on a Bit-by-Bit Basis as either Inputs or High-Current Outputs• Field Connections Accomplished via 50-pin Removable Screw Terminals• Onboard 16-bit 8031 Compatible Microcontroller• All Programming and Calibration in Software, No Switches to Set. Jumpers Available toBy-Pass Opto-Isolators if Desired• Protective Metal T-Box includedDescriptionRDAG12-8 is an intelligent, 8-channel, digital-to-analog converter unit that communicates with thehost computer via EIA RS-485, Half-Duplex, serial communications standard. ASCII-basedcommand/response protocol permits communication with virtually any computer system.RDAG12-8 is one of a series of remote intelligent Pods called the "REMOTE ACCES Series". Asmany as 32 REMOTE ACCES Series Pods (or other RS485 devices) may be connected on a singletwo or four-wire multidrop RS485 network. RS485 repeaters may be used to extend the number ofPods on a network. Each unit has a unique address. Communication uses a master/slave protocolwherein the Pod talks only if questioned by the computer.An 80C310 Dallas microcontroller (with 32k x 8 bits RAM, 32K bits non-volatile EEPROM, anda watchdog timer circuit) gives RDAG12-8 the capability and versatility expected from a moderndistributed control system. RDAG12-8 contains CMOS low-power circuitry, an optically-isolatedreceiver/transmitter, and power conditioners for local and external isolated power. It can operateat baud rates up to 57.6 Kbaud and distances up to 4000 feet with low-attenuation twisted-paircabling, such as Belden #9841 or equivalent. Data collected by the Pod can be stored in local RAMand accessed later through the computer's serial port. This facilitates a stand-alone Pod mode ofoperation.All programming of RDAG12-8 is in ASCII-based software. ASCII-based programming permits youto write applications in any high-level language that supports ASCII string functions.The module, or Pod, address is programmable from 00 to FF hex and whatever address is assignedis stored in EEPROM and used as the default address at the next Power-ON. Similarly, the baud rateis programmable for 1200, 2400, 4800, 9600, 14400, 19200, 28800, and 57600. The baud rate isstored in EEPROM and used as default at the next Power-ON.Page 1-1Manual MRDAG12-8H.Bc2 |
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