RIO-16D I/Os

Terminal Strip Connections

RIO-16D devices connect to power and user signals via four green, screw-terminal connectors. Each pin on these connectors is labelled on the housing's overlay:

AI7, AI6, AI5, AI4, AI3, AI2, AI1

analog inputs; Each input is capable of measuring a signal from 0 to 20mA. The module presents a 250Ω load on each input.

IO1, IO2, IO3, IO4, IO5, IO6, IO7, IO8, IO9, IO10, IO11, IO12, IO13, IO14, IO15, IO16

digital I/Os; These I/Os may be configured as open-collector outputs (20mA max) or left as (Form A or TTL) inputs with the configuration utility. When the associated I/O LED is lit, the I/O is "on" (i.e. pulled to ground internally or externally, depending on I/O configuration).

GND

ground; Negative DC power for the RIO device and electrical reference point for all inputs and outputs. All ground pins are tied together internally.

5V

5 Volt supply for user sensors; Maximum current load is 100mA.

B

positive RS-485 signal

A

negative RS-485 signal

TXD

transmit data, from the RIO-28 to the user device

CTS

clear to send; a high signal indicates that the RIO-28 needs to send data

RXD

receive data, from the user device to the RIO-28

DTR

data terminal ready; used to place the radio into command mode

12V

positive DC power for the RIO device; Both pins are tied together internally.

Most installations do not require hardware handshaking.

Digital Inputs

I/Os configured as digital inputs should be driven to ground to signal "on".

Use a Debounce value of 75 for mechanical inputs and a Debounce value of 0 for digital inputs.

Digital Outputs

RIO-16D I/Os configured as outputs are pulled to ground when "on". They can sink up to 200mA. Here is a typical configuration that uses the output to control a user load:

Analog Inputs

Analog inputs can sense a range of 0 to 20 mA. Here is a typical configuration that uses the analog input to monitor the current through a sensor.