Communication and Control, cont’d
Ports Overview
Flex I/O ports
Extron Flex I/O ports are configurable input or output ports designed to provide connectivity to various devices such as motion detectors, alarms, lights, LEDs, buttons, photo (light) sensors, temperature sensors, relays, etc. All Flex I/O ports are tied to a common ground, but can be individually configured to operate in one of three different modes:
•Digital Input
•Digital Output
•Analog Input
These ports can be configured by using the default Web pages of the IPL T Web Server (see figure
Figure 4-1 — Default Web page for Flex I/O
+30V | +5V |
| 2K |
| SW2 |
| I/O |
24K | SW1 |
GND
Figure 4-2 — Equivalent Flex I/O port circuit
Digital input
When a Flex I/O port is configured as a digital input, the port is set to measure two states: 1 or 0; On or Off; high or low. A closed circuit = a logic 1 and an open circuit = a logic 0.
+30V | +5V |
| 2K |
| SW2 |
| I/O |
24K | SW1 |
GND
Figure 4-3 — equivalent digital input circuit
The Digital Input mode has two configurable options:
1.The ability to turn on an internal
2.Adjustable detection threshold voltages
The default threshold voltages follow standard TTL logic:
a voltage below 0.8VDC is measured as logic low, and a voltage above 2.0VDC is measured as logic high. Using an adjustable threshold, the integrator can select the proper high and low voltages for the installation.
In the figure below, the SW2 switch is turned closed, activating the +5VDC and 2K pull-up resistor.
+30V+5V
2K
SW2
I/O
24K
GND
Figure 4-4 — Sample wiring for a digital input reading an external pushbutton switch
IPL T SF24 and IPL T SFI244 • Communication and Control | IPL T SF24 and IPL T SFI244 • Communication and Control |
