Multi-Tech Systems 7500 - Manual (Page 212)

I/O Expander for ION 8000 Series Meters ION 7500 / ION 7600 User’s Guide
Page 212 Digital and Analog I/O Technical Note
I/O Expander for ION 8000 Series Meters
To get enhanced analog or digital I/O with the ION 8000 Series meters, you can use
an external I/O Expander. Complete information for the I/O Expander is available
in the I/O Expander Installation and Basic Setup Instructions.
The I/O Expander equips an ION meter with eight digital inputs, four Form A
digital outputs, and four Form C digital outputs, or four analog outputs (0 to 20
mA, –20 to 20 mA, or –1 to +1 mA) in place of the four Form A digital outputs. The
I/O Expander also provides a convenient location for the ION meter’s RS-232 and
RS-485 communications wiring.
The I/O Expander is mounted separately, no more than 15 feet away from the
meter. It connects to the meter via a standard Molex Micro-Fit 3.0 connector. RS-
232 and RS-485 links are made via standard DB9 and captured-wire connectors
located on the I/O Expander. The analog output version of the I/O Expander must
be powered by an external source, a standard AC/DC supply.
As the I/O Expander board is external, you can install and configure I/O points
without affecting the meter’s operation. Terminal strips simplify connections to
external equipment. Furthermore, the low-profile connectors between the meter
and the I/O board let you easily remove the meter without disconnecting all the
attached I/O wiring.
External I/O with Grayhill Products
You can change the number of inputs and outputs available for ION meters, or
extend the functionality of the standard digital outputs through external I/O
boards. Just plug Grayhill analog or digital I/O hardware modules into the boards.
For more information, see the Grayhill OpenDAC and ION Technology technical
note, or visit the Grayhill website at www.grayhill.com.
† The ION 7300 Series meter relay expansion board is used to extend the functionality of the standard
onboard digital outputs.
As with onboard I/O, the functionality of these external Grayhill hardware
modules are controlled by ION software modules inside the meter. ION Digital
Output, Analog Output, Pulser, and Calibration Pulser modules specify output
signal characteristics, while the Digital Input or Analog Input modules define
incoming signals.
Meter Digital Inputs Digital Outputs Analog Inputs Analog Outputs
ION 7300 0 4† 0 0
ION 7330 0 4† 0 0
ION 7350 0 4† 0 0
ION 7700 30 30 14 30
ION 8300 8 8 0 4
ION 8400 8 8 0 4
ION 8500 8 8 0 4