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Wiring for RS-232 Control (Optional)
RS-232 communication between the HDMI DA2 and a host PC can be used to update rmware
or configure the distribution amplifier using SIS commands (see “Command and Response
Table for SIS Commands“ on page 19).
The computer connects to either the rear panel 3-pole RS-232 port (
d
in figure 2 on page 3)
or the front panel USB port (
b
in figure 7 on page 9) of the distribution amplifier.
NOTES: • Neither port has precedence and commands from either port are handled in the
order they are received.
• Extron recommends that the USB port is used for temporary connections. If a
permanent connection is required, the RS-232 port should be used.
1. Connect an RS-232 cable, such as Extron universal control cable (UC 50' or UC100') to the
computer, using a female 9-pin D connector (see figure 3):
z Data received by the computer = pin 2
z Data transmitted by the computer = pin 3
z Ground = pin 5
2. Wire the opposite end of the cable to the provided 3-pole captive screw plug (see
figure 3):
z Data transmitted by the HDMI DA2 = pin 1, which plugs into the Tx (transmit) port
z Data received by the HDMI DA2 = pin 2, which plugs into the Rx (receive) port
z Ground = pin 3, which plugs into the G (ground) port
NOTES: • The wiring in the RS-232 cables crosses over so that the Tx on the distribution
amplifier connects to the Rx of the control device and vice versa. Ground always
connects to ground.
• If you use cable that has a drain wire, tie the drain wire to the ground at both
ends.
RS-232
Tx Rx G
REMOTE
TransmitReceive
ReceiveTransmit
GroundGround
DB9 Pin Locations
Female
51
96
Pin 2 = Rx
Pin 3 = Tx
Pin 5 = G
Computer HDMI DA2
Figure 3. Wiring the HDMI DA2 for RS-232 Control
HDMI DA2 • Installation 6