Features
Logic I/O 24/48/120 of TTL level.
Connector interface compatible OPTO 22.
Fan-out : from 24mA to 75mA (upon demand).
Collector outputs opened upon demand.
Programming compatible with the 8255 of INTEL (mode 0).
Defaults of the 8255 eliminated.
1, 2 or 5 HE10 50 pins connectors for flat ribbon cable.
Four programmable interrupt levels (IRQ 3, 4, 5, 7).
3 counters 16 bits (oscillator 4 MHz).
Location for resistances of pull-up or pull-down.
Applications
Acquisition and data processing.
Command of relay and all type of automation in 0-5V.
Logic interface, TTL level.
Functional description
The PC-TOR range is composed by three boards : PC-TOR 24, PC-TOR 48 and PC-TOR 120. They differ from their number of digital lines. They enables to connect the computer to a peripheral which needs a command of logic type. The boards are composed by 3, 6 or 15 parallel ports of 8 bits each and by a timer.
TTL Input/Output Interface
The TTL digital input/output lines are available on one, two or five HE10 50 pins connectors for flat ribbon cable. The front panel connector PC-TOR 24 is directely accessible at the back of the PC. The PC-TOR 48 and the PC-TOR 120 have their connectors regularly spaced inside the board. It is possible to connect one or various flat ribbon thanks to the space located on the maintaining square of the board. The programming is compatible with a PIO 8255 of Intel (in mode 0) i.e the direction of the ports are determined by a control word. The problems due to this component are eliminated :
when the control word is programmed the output ports are initialised with the written value previously. At the contrary, the 8255 standard initialises the outputs to 0 which can cause initialisation problems of the commanded systems.
unlike the 8255 the control word can be read.
The direction of the lines (input or output) is programmed by 8 bits ports (except for the port C in 2 x 4). The TTL ports are marked A, B and C.
Output configuration
All the outputs are bufferised by some 245 and allows an important fan-out by line. Thanks to these characteristics and the wiring pin-layout this board is compatible OPTO22. It allows to command a large number of external modules to the PC available on the market. For the command of external interfaces by opened collectors, you just have to interchange the 245 corresponding by a 641 or 642.
When you power up the board all the lines are in input. In order not to actuate an external interface in output the supports are disposed on each port to have the possibility to place resistances networks in pull-up and pull-down to obtain the desired level in output.
To have a fan-out superior to a 74LS 245 you just have to change of technology (for instance : 74 AC 245) by informing us when you order the product.
The line 50 of the connectors can be connected to GND (standard) o to +12V of the PC by jumper (no protected against the short-circuits).
Timer module
The timer module uses a timer 8254 of Intel. A base clock is available on the board : oscillator of 4 MHz. A jumper area enables to cascade the counters to trigger interrupts o an internal counting.
Addressing
Interrupts possible by each lines PC3 of each connector and by the timer.
Addressing switchable on the board by 32 addresses blocks in the I/O space of the PC. IBM 8 bits bus.
Technical specifications
Input/Output interface
TTL channels : 24 - 48 - 120 lines on HE10 50 pins connector :
With a 74LS 245 buffer :
High input level (VIH) : 2 Vmin.
Low input level (VIL) : 0,8 Vmax.
High ouput level (VOH) : 2,4 Vmin.
Low ouput level (VOL) : 0,4 Vmax.
Maximum output voltage high state (IOH) : -15 mA.
Maximum output voltage low state (IOL) : 24 mA.
With a 74AC 245 buffer :
High input level (VIH) : 3,15 Vmin.
Low input level (VIL) : 1,35 Vmax.
High ouput level (VOH) : 4,4 Vmin.
Low ouput level (VOL) : 0,1 Vmax.
Maximum output voltage high state (IOH) : -75 mA (V = 3,85 V).
Maximum output voltage low state (IOL) : 75 mA (V = 1,65 V).
Interrupts
Four programmable levels of interrupts (IRQ 3, 4, 5, 7).
An interrupt can be generated by the lines PC3 and a counter output.
Size : 11 cm (PC-TOR24), 18 cm (PC-TOR48), 33 cm (PC-TOR 120).
Connector pin assignment
Interface I/O TTL, male HE10 50 points connectors.
Connectors P1, P2/P3, P4/P5 :
PXX = TTL line + 5 V = PC 5 Volts feeding.
GND = 0 Volt TTL signals.
Line 50 to GND or + 12 V of the PC (by jumper).
Ordering information
PC-TOR 24 : Board with 24 logic input/ouput lines.
PC-TOR 48 : Board with 48 logic input/ouput lines.
PC-TOR 120 : Board with 120 logic input/ouput lines.
Option / : free option, fan-out (74AC245 circuit instead of 74LS 245 circuit)
Option / : free option, outputs with opened collector.
Extensions (please report to the corresponding technical handbooks) :
* Ex-Relais-8V, Ex-Relais-16V
* Ex-Relais-Stat
* Ex-Opto24V
* Bornier P50
* Cable for P50
Compatible Digimétrie softwares :
* DigiView series : acquisition - displaying - processing or regulation - test - measure by icons
* DigiTools series : Input/Output routines for DOS and Windows in C, C++ or for Visual Basic 3
The choise of the 74LS245 or 74AC245 technology for the buffers is done upon demand when you order.
The board is delivered with a complete handbook and a list of the corres-ponding softwares.
Rev. 06/96
° Registred trademark of International Business Machine.
This data sheet information are communicated under Digimétrie's international sale and service general conditions.
Digimétrie keeps the right to change, at any time, the features of its products. The photographs are not contractual.
Digimétrie : 30 A, rue E. Renan F-66000 Perpignan FRANCE. Contact : M. Frank Herry
Tel. : (33)04.68.66.54.48 Fax : (33)04.68.50.27.85 E-mail : http://Digimétrie@wanadoo.fr
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