™ Digital488/80A ® 80-Bit IEEE 488/Digital I/O Interface Features • Enables an IEEE 488 interface to pro- gram or read the state of 80 bits of TTL level signals • Divides signals into two 40-bit chan- nels, which are further divided into individual 8-bit ports • Nonvolatile memory stores power-up state of all 80 lines, as well as up to 100 predefined configurations • Available with optional 200 mA high current drive capability and +12V, +24V, and +48V logic levels (HVCX1) Digital488/80A provides an economical link between an IEEE controller and digital signals ™ The Digital488/80A is an IEEE 488/digital I/O interface that enables an IEEE 488 con- Nonvolatile Power-up & High-Voltage Logic Levels troller to program 80 bits of TTL-level sig- When interfacing inputs to +12V, +24V, Setup Configuration nals as either inputs or outputs. Its two or +48V logic levels, optional HVCX1 channels of 40 TTL lines can be treated as The Digital488/80A’s nonvolatile memory configures the Digital488/80A with resis- can store power-up information, enabling multiple 8-bit ports. Six high-level ASCII tor networks to interface to 12V, 24V, or the input/output status and logic level of commands configure the ports as all inputs, 48V logic. When interfacing outputs to every I/O line to be defined when power is all outputs, or combinations of these. In 12V, 24V, or 48V logic levels, HVCX1 uses addition, with optional HVCX1, the unit’s applied. In addition to predefined power-up the high-current open collector drivers in outputs can be configured for high current information, the Digital488/80A has inter- conjunction with optional pull-up resis- nal pull-up resistors, ensuring a logic “HIGH” for switching relays, turning on LEDs, or tors to achieve the appropriate level. the instant power is applied. When using driving indicating devices. When interfac- HVCX1 also includes circuitry for the six the high current outputs, the internal pull- ing to non-TTL-level devices, the HVCX1 handshake and control lines to interface also provides compatibility with 12V, 24V, up resistors ensure that the high current to 12V, 24V, or 48V logic. and 48V logic. outputs are switched off the instant power is applied—a requirement for process con- Internal Buffer trol applications. The unit’s nonvolatile Handshake and Control memory can store up to 100 different set- A built-in data buffer in the Digital488/80A Six handshake/control lines are also pro- ups, allowing a single pre-defined com- can store up to 8,000 bytes—an amount vided for each 40-bit channel, including mand from the IEEE 488 controller to control large enough to permit the capture of Trigger, Data Strobe, Inhibit, Clear, Ser- up to 80 bits of information. 1,000 patterns from one 40-bit I/O chan- vice Request, and External Data Ready nel. When interfacing to slow devices, the lines. The line’s Trigger output is pulsed data buffer relieves the controller of the High Current Driver when a Group Execute Trigger (GET) is need to constantly read data from the received on the bus. The Data Strobe out- With optional HVCX1, each 8-bit port Digital488/80A. put is pulsed when the IEEE 488 control- can be configured to control high current open collector drivers capable of sinking ler presents new data on the I/O lines. The up to 200 mA per I/O line. Each high Inhibit output line is asserted while the current driver has an internal fly-back IEEE 488 controller is reading data from input lines. The Clear output line is pulsed diode for protection when switching whenever a Device Clear or Selected De- inductive devices such as relays. vice Clear command is received from the IEEE 488 controller. The Service Request input can be used to generate a service request to the IEEE controller. The Exter- nal Data Ready input line is used to latch digital input data on the I/O lines into the buffer at up to 10 kHz. 308 www.iotech.com • IOtech, Inc. • 25971 Cannon Rd • Cleveland, OH 44146 • (440) 439-4091 • Fax (440) 439-4093 • sales@iotech.com IEEE 488 Data Acquisition Instruments, Interfaces, & Support Products ™ Digital488/80A ® Specifications & Ordering Information Update Rate: In the binary mode, the Digital488/80A can update one 40 bit I/O HVCX1 Option (partial schematic) channel at up to 2 kHz I/O Port Connections: 2 D-shell 50-pin connectors; mating solder tab connectors supplied Flyback Diode Pull-up voltage (user connection) IEEE 488 Interface Interface Subsets: SH1, AH1, T4, TE8, L4, LE4, SR1, PP0, RL0, DC1, DT1, C0, and E1 Flyback Diode Removable 27K Ohm Connector: Standard IEEE 488 connector with metric studs Pull-up SIP resistor General Output Indicators: LEDs for Talk, Listen, SRQ, Error, and Power (user connection) Power: 90 to 125V or 210 to 250V, 50/60 Hz; 20 VAC max Environment: 0˚ to 50˚C; 0 to 95% RH, non-condensing Controls: Power switch, external dip switch for IEEE 488 addressing mode and IEEE 488 address 200 mA (max) Optional Accessory: HVCX1 option for both 40-bit I/O channels consists of: Option HVCX1 high current/voltage output HVCX1 High Voltage/Current Interface Option RN-3-20K 20K Resistor DIP Pack (12) RN-3-56K 56K Resistor DIP Pack (12) RN-3-120K 120K Resistor DIP Pack (12) 10 Ohm, 20K, 24K, or 48K DIP RN-9-27K 27K Pull-up Resistor SIP Pack (10) Resistor Pack Input Dimensions: 425 mm W x 203 mm D x 45 mm H (16.75” x 8” x 1.75”) (user connection) Weight: 4.5 kg (10 lbs) Input Ranges (HVCX1 option only) 15K Ohm Nominal Logic Nominal Logic Input Input Low Voltage High Voltage Range Resistance (±10%) (±10%) 0 to 5V 0.8V 2.4V 15K Ohm Option HVCX1 12V, 24V, or 48V logic input 0 to 12V 1.9V 5.75V 35K Ohm 0 to 24V 4.2V 11.5V 61K Ohm 0 to 48V 8.4V 23V 135K Ohm Ordering Information Description Part No. 80-bit IEEE 488/digital I/O interface, including two mating solder-tab D-shell connectors; power cord; and rack-mount kit Digital488/80A Accessories & Cables High current/voltage interface module HVCX1 Shielded IEEE 488 cable, 6 ft. CA-7-3 50-pin ribbon cable, 6 ft. CA-88 12 The HVCX1 option is user-configurable as either input or output in 8-channel multiples For complete information on accessories and cables, visit www.iotech.com/acc Specifications Related Products Digital I/O Interface Hardware Digital I/O Capability: Dual channels, each with five 8-bit ports, programmable Personal488 Series as inputs or outputs; programmable handshake lines, data latching capability, an SRQ input, and trigger and clear outputs Logic Levels: Outputs will drive 2 TTL loads (3.2 mA sink); optional 12V, 24V, and 48V logic support for both 40-bit I/O channels available with the HVCX1 interface module Optional High-Current Outputs: With HVCX1, the outputs can be configured, in groups of eight, as high current outputs; each high-current output is capable of sinking up to 200 mA at 50 VDC max; total current sinking capability, 8A max 309 www.iotech.com • IOtech, Inc. • 25971 Cannon Rd • Cleveland, OH 44146 • (440) 439-4091 • Fax (440) 439-4093 • sales@iotech.com