Extron Electronics IPL T SFI244 - Manual (Page 27)

Analog input
When a flex I/O port is configured as an analog input, the port can measure 0 to 25.3 VDC
with 12-bit accuracy. A DC level is indicated by a count from 0-4096 (≈ 6 mv/count).
10
+30V
+12V
GND
24K
10K
I/O
Figure 20. Sample of an Analog Input for a Level Adjustment, Using a 10K Pot
Bidirectional Serial Control Interface Ports
The IP Link ® family of products has several models that incorporate bidirectional serial
control ports. The serial ports allow for control of a wide variety of existing Extron and
third-party devices. The most common serial control formats are RS-232, RS-422, and
RS-485. With the IPL T SFI244, the captive screw connector is an implementation for the
serial control ports.
Captive Screw Connectors — On the IPL T SFI244 unit, all of the serial interface ports
are connected on captive screw terminals. When using the ports on the captive screw
terminals, only RS-232 control is available, and hardware handshaking is unavailable.
Since RS-232 is the most common control interface encountered, this port configuration
allows for quick termination.
NOTE: Pacing and handshaking are not supported on captive screw connectors.
All of the bidirectional serial ports are completely software configurable. Baud rates can
be set up to 115 Kbs. Using the Simple Instruction Set (SIS) commands found in the
Programmer’s Guide for the Telnet and Web Browser , these ports can be configured
to control most serial devices. Once a port is configured and properly cabled to the
controlled device, serial commands can be issued to the port from a Web page, Telnet
connection, or by using the advanced scripting capability built into the IP Link product
family.
IPL T SFI244 • Communication and Control 21