® OpenDAC I/O System ® OpenDAC I/O System NETWORK INTERFACES ® OpenDAC for Modbus FEATURES  Each Unit Controls/Monitors up to 32 Analog and/or Digital I/O using ® OpenLine Modules ®  Network up to 247 OpenDACs per Host PC, Each Separated by as much as 4,000 Feet  Communicate Over RS-422/485 at Speeds from 9600 Baud to 56.7 KB  100% Modbus ASCII or Modbus RTU Compatible  CE Certified  DIN Rail or Panel Mount ® MODBUS UNIT ON OPENDAC SYSTEM APPLICATIONS GENERAL DESCRIPTION ® format to code the command and the response OpenDAC for Modbus is an inexpensive, Stand Alone Control flexible interface to 32 analog or digital messages. Application programs running on ® the host computer issue commands and then OpenLine I/O. As one of 247 slave devices on Local Control & I/O ® ® a Modbus network, OpenDAC for Modbus await responses from the OpenDAC . The communications speed is switch selectable constantly scans and stores the current status Remote I/O between 9600 and 56700 baud. The entire of each I/O. Upon command from the host device, the controller will change the status of network can span 4000 feet. Distributed I/O an output or return the value of an input. The slave address is switch selectable. Diagnostic FAULT TOLERANCE SCADA ® LEDs provide troubleshooting assistance. Each OpenDAC for Modbus has an internal communications watchdog timer to minimize RTU the impact of a broken Modbus link between the ANALOG & DIGITAL I/O ® controller and the master device. If activated, OpenDAC for Modbus connects directly to two the timer must be reset by an incoming message 16 channel racks. Any combination of analog within the prescribed period of time. If not, the and digital I/O modules may be used. On power controller will force it’s outputs into a default ® up, the OpenDAC scans and stores the I/O state. configuration and makes the information available to the master for query. SOFTWARE Software drivers are available which simplify In addition to simple On/Off instructions, Modbus commands allow you to: the task of interfacing host programs written in Visual Basic or C to the Modbus network. Sample  Read linearized thermocouple and RTD programs, set-up and debug utilities are included temperature values  Count pulses at frequencies up to 1000Hz on the disk with the drivers. Interface drivers for most third party software packages are available  Detect rising or falling edges  Latch momentary input events through their distributors. Our DLL will assist you in building custom Man-Machine Interfaces  Set the level of analog outputs ++ using Visual Basic, Visual C/C , or Borland compilers running on Windows 95, 98 or NT. COMMUNICATIONS ® The host computer and OpenDAC for Modbus communicate serially over one or two pair of twisted wires per RS-422/485 in a multi-drop configuration. They use Modbus ASCII or RTU OpenDAC Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com 4 ® OpenDAC I/O System ® OpenDAC I/O System DIMENSIONS In inches (and millimeters) 4.1(104.26) 1.1 3.9 (99.56) (28.22) DIN RAIL LATCH 1.0 (25.86) 3.0 (75.69) 2.6 (65.48) 2.3 (57.17) PIN 1 TO CENTERLINE OF DIN RAIL CHANNEL SPECIFICATIONS ORDERING INFORMATION Power Supply: 4.75 to 5.25 Vdc Part Number Description Supply Current (less modules): 1 amp @ 5 Vdc max. ® OpenDAC Network Interface Operating Temperature: 0 to 60°C ® 72-MOD-4000 Analog/Digital OpenDAC for Modbus Humidity: 95% non-condensing Microprocessor: V25 @ 10 MHz ® Housing Material: ABS/Polycarbonate blend OpenDAC User’s Manual and Software Connections: ® 72-UM-OMOD OpenDAC for Modbus user’s manual RS-422/485: 5 position depluggable connector 72-UME-DLL32 Ethernet/Modbus DLL for Windows 95/98/NT Passive Rack: 48-pin Euro DIN (male) ® 72-UOL OpenLine configuration and product data Serial Data: Format: 10 Bit ASCII: 1 Start, 1 Stop, 8 Data Integrity: Message Checksum Compatible Components Range of Network: Compliant with EIA/TIA ® OpenDAC I/O Racks RS485-A (1 standard load per controller). ® Digital OpenLine I/O Modules Operates in multi-drop mode. 247 DIP switch ® Analog OpenLine I/O Modules selectable addresses. May require RS485 Power Supply repeaters for lengths over 4000 feet or more than 32 controllers. Consult factory for special configurations. Available from your local authorized Grayhill Distributor. For prices and discounts, contact your local sales office, an authorized Distributor, or Grayhill. OpenDAC Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com 5