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iRIS 220 / iRIS 320, V1.19 User Guide - 14
14
iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: iquest@iquest.co.nz
3.4 I/O Connector
All I/O and power supply terminations are via 5mm (0.2”) screw terminals provided on a 16-way pluggable
connector. The older (V1.1) PCB has a 12 way connector - see Appendix D – Legacy PCB (Rev 1.1)
Details. The I/O connector is positioned on the right hand side of the iRIS 320 circuit board, directly above
the white battery connector. On the iRIS 220, the connector protrudes through the top of the case.
The function of each I/O termination is shown in the diagram below.
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AI4 Analog Input #4
AI3 Analog Input #3
AI2 Analog Input #2
AI1 Analog Input #1
AGND Analog Common Ground
5VOP 5V Reference Output
DI2 Digital Input #2
DI1 Digital Input #1
DO2 Digital Output #2
DO1 Digital Output #1
SDI-12 SDI-12 Data Bus
DGND Digital Common Ground
12V+ 12Vdc Internal/External Battery Supply +
GND (-) 0Vdc Internal/External Battery Supply -
VIN+ 15-30Vdc External Power Supply (Charger Input) +
GND (-) 0Vdc External Power Supply (Charger Input) -
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Figure 4 - I/O Connector
3.4.1 Internal Battery (iRIS 320 / iRIS 320V only)
The iRIS 320 / iRIS 320V are supplied with an internal rechargeable 12V 0.8A/Hr sealed lead-acid battery.
Upon installation, you will need to connect this battery as it is shipped disconnected to preserve battery life. It
should also be disconnected if the unit is not going to be used for some time.
NOTE: The iRIS 220 does not have an internal battery, so ignore all references to the internal battery
for the iRIS 220 models.
For maximum flexibility, the iRIS I/O connector has two terminals provided for additional 12V power supply
flexibility. These terminals (marked 12V+ and GND) can either be used to deliver 12V from the internal
battery out to power an external sensor or other small load, or alternatively be connected to an external 12V
battery (for greater battery capacity) or a 12V d.c battery charger type power supply. See the next two
sections on using the 12V terminals and the external (charger) power supply feature.
WARNING!
iRIS 320 / iRIS 320V INTERNAL BATTERY
The +12V and GND terminals of the I/O connector are effectively connected directly in parallel with
the internal 12V battery. A resettable semiconductor fuse is fitted for short-circuit protection.
However, only connect 12V lead-acid batteries or a regulated d.c power supply that is designed
for charging a 12V lead-acid battery, to these terminals.
Applying a voltage higher than 14.5V for a sustained period to these terminals will permanently
damage the internal battery and may cause an acid leak and/or an explosion.