
Page 2 SP Controls, Inc.
RS-232 Communicaon Interface. The SW1900-HD uses a serial interface (RS-232) to change
aributes and behavior of the SW1900-HD. Parameters are as follows: 115200 baud, 8 bit, no
parity, and 1 stop bit. The baud rate is adjustable. Pins 2 (Rx), 3 (Tx), and 5 (GND) are used. See
the SW1900-HD Programming Guide for available commands.
Power. Connect the DC power supply to the locaon “DC/5V”. The Power Indicator LED will
illuminate above of the DC/5V locaon to indicate that power is being received.
Auto-Sense, Auto-SwitchingAuto-Sense, Auto-Switching
Auto-sense, automac switching (ASW) is a very powerful feature of the SW1900-HD but should
be explained to gain the best understanding of how it can be ulized. ASW is enabled by default
but can be disabled using the RS-232 interface.
The SW1900-HD is very sensive. When one connects a device to one of the 5 HDMI input
ports, the SW1900-HD responds immediately by roung the video from that device to the
display. If the color space is dierent than the display, the color space is automacally converted
internally to ensure the highest quality image is displayed at the highest resoluon praccable.
If another person connects her computer or iPad to an HDMI input port that person’s device will
appear. The last to connect will always appear on the display.
Should a device that is acvely displayed be disconnected, the SW1900-HD begins searching
from input 1 through input 5 for the next available input. Once an acve signal is found the
image from that device will appear on the display. Therefore, consider having the home room
computer on input 1 and any ancillary or guest connecons on inputs 2 through 5.
Automatic Display On/OAutomatic Display On/O
Automac display on/o (CEC) is another very powerful feature of the SW1900-HD and should
also be explained to gain the best understanding of how it can be ulized. CEC is enabled by
default but can be disabled using the RS-232 interface.
CEC must be enabled on the display itself for this feature to work with the SW1900-HD.
Trade names for CEC are Anynet+ (Samsung), Aquos Link (Sharp), BRAVIA Link and BRAVIA
Sync (Sony), HDMI-CEC (Hitachi), E-link (AOC), Kuro Link (Pioneer), INlink (Insignia), CE-Link
and Regza Link (Toshiba), RIHD (Remote Interacve over HDMI) (Onkyo), RuncoLink (Runco
Internaonal), SimpLink (LG), T-Link (ITT), HDAVI Control, EZ-Sync, VIERA Link (Panasonic),
EasyLink (Philips), and NetCommand for HDMI (Mitsubishi).
If one connects to the SW1900-HD the SW1900-HD will turn the display on. When the last
person disconnects, the SW1900-HD will wait 30 seconds of inacvity then turn o the display.
In many cases, this feature eliminates the need for remotes, extends display life, and saves on
power. This feature also simplies conference rooms and huddle spaces making them more
usable.