Serial Interface; Technical Background; Signal Transmission - Example - Lightware UMX-TPS-TX120 User Manual

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4. Device Concept
4.7. Serial Interface
4.7.1. Technical Background
Serial data communication can be established via the local RS-232 port (Phoenix connector) or via the TPS
lines. The RS-232 ports – which are connected to the CPU – can be configured separately (e.g. if the Baud
rates are different, the CPU does the conversion automatically between the ports). The RS-232 port can be
switched to Pass-through mode, Control mode, or Command Injection mode; see the figure below.
Block diagram of the serial interface
The following settings are defined:
1 The Local and the TPS serial ports are in Control mode.
2 The Local and the TPS serial ports are in Pass-through mode.
3 The Local and the TPS serial ports are in Command Injection mode.

INFO: All settings are available in the LDC software, see settings in the
Only one mode can be used at the same time: Control mode, or Pass-through mode, or Command Injection
mode. If you choose one of them, TPS serial link and local RS-232 port will operate in the same 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 local RS-232
port to the TPS output port and vice versa inside the transmitter.
RS-232 Tab section.
Applied firmware packages: (UMX-TPS): v1.5.0b4 | (WP-UMX-TPS): v1.4.0b8 | (FP-UMX-TPS): v1.4.0b8 | LDC software: v2.5.6b2
UMX-TPS-TX100 series – User's Manual
Control Mode
The incoming data from the given port is processed and interpreted by the CPU. The mode allows to control
the transmitter directly. LW2 or LW3 protocol commands are accepted – depending on the current port
setting.
Command Injection Mode
In this mode, the transmitter works as an RS-232 bidirectional converter. The TPS signal is converted to
RS-232 data and vice versa. TCP/IP port numbers are defined for the serial ports (TPS and local) for this
purpose. E.g. the default Command Injection port number of the local RS-232 port is 8001. If a command
is coming from the TPS interface which addresses to the port no. 8001, it will be transmitted to the Tx pin
of the local RS-232 port. That works in the opposite direction of course and the method is the same on the
serial interface of the TPS port as well.
4.7.2. RS-232 Signal Transmission – Example
The Concept
The System controller can send commands to the transmitter and it is able to remote control the projector
through the TPS receiver via RS-232.
Settings
▪ System controller: wireless IP connection to the same Ethernet as the transmitter is connected to. Use
a dedicated software tool (e.g. a terminal) which is suitable for sending commands via TCP/IP to a
certain IP:port address.
▪ Transmitter: set the RS-232 mode to Command Injection on TPS output port. Set the further parameters
(Baud rate, Data bits, etc.) in accordance with the specifications of the projector. The transmitter will
transmit the RS-232 data toward the receiver.
Receiver: set the RS-232 mode to Pass-through on RS-232 port.
▪
▪ Projector: note the RS-232 port setting that is specified by the Manufacturer. Connect a suitable serial
cable with the proper wiring.
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