Serial Interface - Lightware HDMI20-OPTC series User Manual

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3. Product Overview
3.8.3. 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,
see the figure below.
Port Diagram of Serial Interface
HDMI20-OPTC-TX220-Pro
RS-232 /
OPTC converter
Operation
mode
PASS
CPU
RS-232
CONTROL
Device control
(local serial)
CI
Device control
(IP)
RS-232 /
TCP converter
Ethernet
Ethernet
Switch
The following operation modes are defined:
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
control the extender directly. LW3 protocol commands are accepted.
HDMI20-OPTC-RX220-Pro
Fiber Fiber
LINK
RS-232 /
OPTC converter Operation
mode
PASS
CPU
CONTROL
Device control
(local serial)
CI
Device control
(IP)
RS-232 /
TCP converter
Ethernet
Switch
HDMI20-OPTC series – User's Manual
Command Injection Mode
In this mode, the extender works as a TCP/IP <-> RS-232 bidirectional converter. The TCP/IP data signal
is converted to RS-232 data and vice versa. TCP/IP port numbers are defined for the serial ports for this
purpose. E.g. the default Command Injection port number of the local RS-232 port is 8001.
INFO: The commands in this mode not transmitted via fiber, they operates between the local ports.
RS-232 Signal Transmission - Example 1
System controller
RS-232
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 over the fiber optical
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.
Ethernet
In this case the RS-232 port of the transmitter and receiver has to be set to Pass-through mode.
RS-232 FIBER OPTICAL RS-232
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HDMI20
OPTC
220-PRO
Projector