MD-IO84B
8 Input/4 Output Expansion Module for AC-225x-B / AC-425x/B Control Panels
Installation Manual
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1. Introduction
The MD-IO84B is an optional I/O expansion board for use with Rosslare’s
AC-225x-B and AC425x-B series of networked access control panels.
This expansion board adds an additional four relay outputs and eight
supervised inputs to the access control panel.
The host access controller has complete control over the additional inputs
and outputs of the MD-IO84B expansion board. The inputs and outputs
can be configured using an access control software system such as
Rosslare AxTraxNG™. The software system also configures t he MD-IO84B's
input connection topology.
Once connected to the system, these IO devices can allow you to scale and
expand your sy stem and by using AxTraxNG™ management you can
program extended access control features, adding more automation
capability to the your system.
This guide explains how to install and begin working with your new MDIO84B access controller expansion board.
Figure 1: MD-IO84B
2. Technical Specifications
2.1 Electrical Characteristics
Input Voltage
12 VDC
Input Current
(not including attached devices))
Standby: 3 0 mA
Maximum: 135 mA
Number of Inputs
8
Number of Outputs
4
Output Relays
5 A with N.O., N.C., and COM contacts FormC relays
Inputs Voltage
5 VDC maximum voltage
2.2 Input Characteristics
Input Type:
Selectable as:
• Normally Open
• Normally Closed
• Non-supervised (2 states)
• Supervised with one resistor (3 states)
• Supervised with two resistors (4 states)
2.3 Physical Characteristics
Dimensions (L x W x D)
100 x 75.9 x 32.5 mm (3.9 x 3.0 x 1.3 in.)
Weight:
98.2 g (3.5 oz)
2.4 LED Indicators
Power LED:
Active when connected to a power sour ce
Output LEDs:
Four LEDs
Each output LED is active when an output relay is
energized and N .O. to COM contacts are shorted.
3. Attaching the MD-IO84B
To attac h the MD-IO84B:
1. Disconnect power to the access control panel bef ore attaching th e
MD-IO84B.
2. Remove the MD-IO84B cover by lightly pulling one of the cover knobs
away from the circuit board. The entire cover comes away from the
board.
3. Peel off the label on the cover of the panel marked "Remove to install
I/O board".
The label is located on the same side of the panel as the DIP switch.
4. Insert the 10-pin male connector of the MD-D02B into the gap in the
panel cov er labeled "IO EXPANSION SLOT".
The text on the MD-D02B mus t face the same way as the text on the
panel cov er.
5. Tighten the screws s ecuring the cover to the access control panel, and
the four Philips screws on the MD-D04B circuit board.
6. Replace the cover on the expansion board, using it as a guide to ease
the MD-D04B into the panel's 10-pin female connector.
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4. Wiring Instructions
4.1 Input Wiring Options
There are 4 input wiring options:
§ Normally Open
§ Normally Closed
§ Normally Open Supervised with one or two resistors
§ Normally Closed Supervised with one or two resistors
Figure 2 shows the normally open input connection.
Figure 2: Normally Open Input
Figure 3 shows the normally closed input connection.
Figure 3: Normally Closed Inputs
Figure 4 shows the normally open supervised input connection with single
resistor.
Figure 4: Normally Open Supervised Inputs with Single Resistor
Normally Open Su pervise d inputs with o ne resistor must be connected
with an 8.2 kΩ resistor in parallel to the input switch contacts.
Always wire resistors on the input switch and not on the terminal
block.
Figure 5 shows the normally open supervised input connection with
double resistor.
Figure 5: Normally Open Supervised Inputs with Double Resistor
Normally Open Su pervise d inputs with two resistors must be connected
with an 8.2 kΩ resistor in parallel and a 2.2 kΩ resistor in series to the
input switch contacts.
Figure 6 shows the normally closed supervised input connection with
single resistor.
Figure 6: Normally Closed Supervised Input with Single Resistor
Normally Closed Supervised inputs with a single resistor must be
connected with a 2.2 kΩ resistor in series to the input switch contacts.
Figure 7 shows the normally closed supervised input connection with
double resistor.
Figure 7: Normally Closed Supervised Input with Double Resistors
Normally Closed Supervised inputs with two resistors must be connected
with an 8.2 kΩ resistor in parallel and a 2.2 kΩ resistor in series to the
input switch contacts.
4.2 Outputs
Electrical devices can be switched using the voltage free r elay contacts.
Rosslare recommends using suppression diodes for all outputs that are
connected to inductive loads and activated by DC current, such as
Magnetic Loc k ("Maglock") or door strike devices.
Each suppression diode must be connected near its inductive load. Always
attach the diode's cathode to the +V terminal of the load. Attach the
diode's anode to the –V terminal.
For more information, refer to your access controller's Installation and
User Guide.
5. Operating the MD-IO84B
The access control panel detects the MD-IO84B expansion board w hen it
powers up. When defining the panel in the access control panel's PC
application (such as AxTraxNG), select the option designating the panel
name with a designation of “MD-IO84B”.
Define inputs and outputs using the access system software.
Define each input's type and make sure the connection is compatible with
the input wiring.
Input and outputs type and function selection in the access control
software are usually similar to the host access control panel general
purpose inputs and outputs.
When using AxTraxNG, define input types from the "Inputs " tree menu.
Input and output functions are defined using the "Links" element within
each "Pa nel" tree m enu it em.
For more information, refer to the AxTraxNG™ Software Installation and
User Manual.
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