3. Product Overview HDMI20-OPTC series – User's Manual 21
Serial Interface
INFO: HDMI20-OPTC series extenders are DTE unit according to their pin-out. For more details about pin
assignment see RS-232 Port section.
Serial data communication can be established via local RS-232 port (D-SUB male connector). Three different
RS-232 modes can be set for the serial port: pass-through mode, control mode, command injection mode,
Port Diagram of Serial Interface
▪ PASS: The local serial port is in Pass-through mode.
▪ CONTROL: The local serial port is in Control mode.
▪ CI: The local serial port is in Command Injection mode.
Pass-through Mode
In pass-through mode, the given device forwards the data that is coming from one of its ports to another
same type of port. The command is not processed by the CPU. Incoming serial data is forwarded from one
port to another port.
ATTENTION! Both the transmitter and the extender have to be set Pass-through mode, in case of sending
RS-232 commands from the TX side to the third party device on the RX side.
Control Mode
The incoming data from the given local port is processed and interpreted by the CPU. The mode allows to
Operation
mode
Fiber
Ethernet
RS-232
HDMI20-OPTC-TX220-Pro
HDMI20-OPTC-RX220-Pro
LINK
RS-232 /
OPTC converter
CPU
Device control
(local serial)
Ethernet
Switch
RS-232 /
TCP converter
Device control
(IP)
PASS
CONTROL
CI
Fiber
RS-232 /
OPTC converter
CPU
Device control
(local serial)
Ethernet
Switch
RS-232 /
TCP converter
Device control
(IP)
Operation
mode
Ethernet
RS-232
PASS
CONTROL
CI
Command Injection Mode
purpose. E.g. the default Command Injection port number of the local RS-232 port is 8001.
RS-232 Signal Transmission - Example 1
The Concept
You can control the Projector over the extenders with the System controller. The controller is connected to
the local RS-232 port of the Transmitter which transmits the signal toward the Receiver
line. The Projector is connected to the local RS-232 port of the Receiver. The serial connection is bidirectional
which means the controller gets back the responses of the projector.
In this case the RS-232 port of the transmitter and receiver has to be set to Pass-through mode.
System controller
RS-232 FIBER OPTICAL RS-232
HDMI20-OPTC-TX220-Pro
transmitter
HDMI20-OPTC-RX220-Pro
receiver
Projector
HDMI20-OPTC-RX220-Pro
HDMI 2.0 Multimode Fiber Receiver
POWER / LIVE
FIBER LINK
HDCP
SIGNAL PRESENT
OUTPUT CONVERSION
CONTROL
FUNCTION
USB
HDMI20
OPTC
220-PRO
MAIN MENU
> System Settings
Ports
EDID
Health
Remote
POWER / LIVE
FIBER LINK
HDCP
INPUT 1
INPUT 2
CONTROL
SELECT
USB
HDMI20
OPTC
220-PRO
HDMI20-OPTC-TX220-Pro
HDMI 2.0 Multimode Fiber Transmitter
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