Reference Manual

113501

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3.1 Opto Coupled Inputs (INPUT 1…4)

The opto-coupled inputs are tied to 5V via the internal opto-isolator, a

limiting resistor and an input status LED. Left open, no current flows

and the status LED is off. If the input is tied to ground, directly through

dry relay contacts, or via a resistor of up to 100 ohms, the LED will

light and the ILR CARD will see the input as ‘pulled low’. Resistance

of greater than 100 ohms may cause the LED to glow but may be

insufficient for the input to be seen as ‘pulled low’.

3.2 Opto Coupled User Outputs (RLY 1a, 1b…4a, 4b)

The four relay outputs are opto-isolated solid state relays offering

5,000V isolation with a current rating of 130mA at 350V. The contacts

are normally open, indicated by the corresponding status LED being

unlit. The status LED lights when the relay contacts ‘close’. Both

contacts are electrically isolated from other system voltages and float.

3.3 Test Serial Port

The test serial port is set to 9600 baud and is a 3 wire port (TX, RX and

GND). It offers 15KV isolation and is true RS232. Data to and from

this port are relayed by the ILR CARD to the host computer.

3.3.1

RS232 9 Pin Interface Connection for Test Serial Port

Signal Name Pin

TEST TX 2

TEST RX 3

GND 5

3.4 Bar Code Interface

The Bar Code serial port is set to 9600 baud and is a 4 wire port (TX,

RX, Trigger and GND). It offers 15KV isolation and is true RS232.

Data to and from this port are relayed to the host computer by the ILR

CARD. This connection is intended for a tethered bar code scanner with

the power provided by one of the 5V auxiliary outputs.

This input can be switched from RS232 to RS485 if long

communication range is needed. This connection can be used to connect

any serial input device. The slide switch for RS232 or RS485 is at the

top of the i-PORT, and is described in section

5 Selector Slide Switches

3.4.1

RS232 9 Pin Interface Connection for Bar Code