Med Associates Inc: Interface Modules and Components

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Input/Output Modules and Components
28 V DC Input		28 V DC Output
Modules for TTL Input & Output		TTL to 28 V DC Adapters
Standalone PCI Interface	Dual AC Outlet		PCI Interface Card

Interface Modules for 28 Volt DC Input

DIG-711
Standard Input Module

DIG-711A
NO/NC Input Module

DIG-712
SuperPort™ Input Module

DIG-712F
SuperPort™ Fast Input Module

The DIG-711 and DIG-711A modules contain eight optically isolated input lines, each with a small status indicator lamp. Both feature screw terminal connections for normally open switches operating from a 24 to 28 V DC power supply. This includes -28 V supplies. The DIG-711A also includes jumper settings to invert the input function for normally closed switches.

The DIG-712 and DIG-712F modules contain sixteen optically isolated input lines for both normally open and normally closed switches wired to a single DB-25 connector. The DIG-712F has a faster time constant (100 Hz vs. 10 Hz) and is recommended for pigeon keys. Use DIG-712 for most other applications.

Any of the input modules may be set to pulse (also known as transition mode) or level modes of operation. In the pulse mode switch closures are filtered, contact debounced and latched. A single switch closure sets a latch on the card that is held until read and reset by the computer. In the level mode, only an input that is present when the card is read is recognized. With MED-PC^® IV, WMPC™ and Schedule Manager™ software the level mode produces a count every interrupt (typically 10 ms) for as long as the input "switch" is closed. In general, use pulse mode with response levers or keys to increment a single count for each response, and use level mode with photobeams and nose pokes to determine how long the beam is interrupted or to define beam breaks with specific time values.

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Interface Modules for 28 Volt DC Output

DIG-721
Standard Output Module

This single width module provides eight 3 A DC drivers designed to activate a 28 V DC device by providing the ground (-28 V) signal. Each output is optically isolated to protect the computer from external noise in the peripheral power supply or environment. Connections are made on a convenient front panel terminal strip. Eight adjacent indicator lamps report the status of each output.

Pulse or level modes of operation are selected with individual onboard jumpers for each output. In the level mode, outputs turned on by the computer remain on until turned off by the computer. In pulse mode, outputs remain on for a user set time duration from 40 milliseconds to 4 seconds. The hardware timers are set through an opening in the front panel for each output.

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DIG-726
SuperPort™ Output Module

This single-width module is similar to the DIG-721. It features sixteen optically isolated outputs with 3 A solid state DC drivers, however, each output operates in a level mode only. The pulse mode was dropped in this later design because that function is now easily covered in software. Connections are made through a DB-25 connector on the front panel. Sixteen LED indicators designated as either P1 (port 1) or P2 (port 2) provide a visual indicator of the status of each output at all times.

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DIG-722A
Relay Output Module

This single width module contains eight single-pole double-throw relays rated at 2 A, 30 V DC. Both the normally open (NO) and normally closed (NC) contacts are wired to a female DB-25 connector. A mating connector and hood are provided with each module. This module functions in level mode only. Once a relay is activated by the computer, it remains on until turned off by the computer.

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Interface Modules for TTL Input & Output

DIG-710
Standard Input Module

DIG-713A TTL
SuperPort™ Input Module

DIG-720
Standard Output Module

DIG-726TTL
SuperPort™ Output Module

TTL Input

The DIG-710 and DIG-713A TTL modules feature eight and sixteen TTL logic inputs respectively. Each input bit is associated with its own LED indicator. These inputs are compatible with sinking 5 Volt TTL Logic where a logic 1 is 0 Volts and logic 0 is 5 Volts. Select transition (pulse) or continuous (level) modes through onboard jumpers. The DIG-713A SuperPort™ also includes jumpers for normal and inverted, making it compatible with logic where a logic 1 is +5 Volts. This module is also used with all RotoRatT rotational activity systems, and with the ENV-256C and ENV-256I Photobeam Controls. Connections to the DIG-710 module are made to .080" (2.0 mm) pin jacks, while connections to the DIG-713A module are made via a single DB-25 connector.

TTL Output

The DIG-720 and DIG-726TTL single width modules feature eight and sixteen TTL logic outputs respectively. Each output bit is associated with its own LED indicator. These outputs are compatible with sinking 5 Volt TTL Logic where a logic 1 is 0 Volts and logic 0 is 5 Volts and operate in level mode only. A ground (0 Volts) is provided at the output when it is turned ON. Connections are made to the DIG-720 module via .080" (2.0 mm) pin jacks while connections to the DIG-726TTL go through a DB-25 connector. The DIG-726TTL Output Module and DIG-713A Input Module are particularly useful in connecting a MED-PC^® interface to a SmartCr™ real time cumulative recorder interface.

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TTL to 28 V DC Adapters

The following adapters have been provided to permit control of a single device, such as a pellet dispenser, from a 5 V TTL output. An internal jumper allows you to select "active high" to turn on the device when the TTL signal transitions from 0 to 5 Volts, or "active low" to turn on the device when the TTL signal transitions from 5 to 0 Volts. Units are generally shipped from the factory "active low" unless otherwise requested. These devices do not include the 28 V DC Power Supply, which can be ordered separately. For small applications we recommend the SG-501 power supply.

SG-230
TTL to 28 V DC Adapter

This device requires 5 V DC power from the controlling device. Connections are made via a convenient terminal strip. The output connector is a three-pin mini-Molex^®, which is compatible with all Med Associates' 28 V DC components. The 28 V input connector is a two-pin polarized Molex^®. Use the SG-210CP-8 power cable to connect the SG-230 to the 28 V DC power supply. The cable is sold separately.

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SG-230R
TTL to 28 V DC Powered Adapter

This device is similar to the SG-230 except that it does not require a +5 Volt connection to the controlling device. It does however still require connection to 28 V DC. Like the SG-230, connections with the TTL device are made via a convenient terminal strip, the output connector is a three-pin mini-Molex^®, and the 28 V DC input connector is a two-pin polarized Molex^®.

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SG-230RC
TTL to 28 V DC Powered Adapter with Coax Connector

This device is similar to the SG-230R as neither require a +5 Volt connection to the controlling device. The SG-230RC differs in the connection to the controlling device is made via a standard BNC cable. It requires connection to 28 V DC. The output connector is a three-pin mini-Molex^®, and the 28 V DC input connector is a two-pin polarized Molex^®.

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SG-231
28 V DC to TTL Adapter

This device is designed to take a 28 V DC output and convert it to a TTL transition. This may be useful to event mark a separate physiological data acquisition system for example. For multiple TTL outputs see DIG-710 and DIG-726TTL interface modules with eight and sixteen outputs respectively. Connections to the SG-231 are made via convenient screw terminals.

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DIG-725
Dual AC Outlet

This unit connects to a standard 28 V DC output card to control a 115 V AC device. It consists of an enclosure that houses two noise free zero cross over AC relays connected to a standard duplex outlet. Each half of the outlet is independently switched ON/OFF by a separate control line, and each has a green LED to indicate its status. Use with a SmartCtrl™, Standard, or SuperPort™ 28 V DC Output Module. A standard power cord is provided to connect to a properly grounded 115 V AC 60 Hz Outlet. The operate connection is made via a three pin Molex^® connector. Order two SG-216A-10 3-pin Molex^® extension cables to connect to a SmartCtrl™ or passive connection panel. Contact sales if a 230 Volt 50 Hz application of this product is required.

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DIG-729PCI
High Speed Serial Microcontroller

This PC-compatible PCI interface card can be custom programmed to control startle reflex systems , open field activity systems as well as other Med Associates products such as programmable pumps and aversive stimulation delivery modules. Use the SG-219C-10 cable to complete this connection. If ordering separately, please be sure to specify what the card is to be used for.

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Site Updated: May 1, 2008

Input/Output Modules and Components