4. Device Concept MMX4x2 series – User's Manual 33
RS-232 Serial Interface
Technical Background
ATTENTION! Only MMX4x2-HT200 model has TPS serial link port.
Serial data communication can be established via the local RS-232 port (Phoenix connector) or via the TPS
rates are different, the CPU does the conversion automatically between the ports). The RS-232 port can be
Block diagram of the MMX4x2-HT200 serial interface
1
The serial port is in Control mode.
2
The serial port is in Command Injection mode.
3
The serial port is Disconnected.
INFO: RS-232 section.
Only one mode can be used at a time: Control mode, or Command Injection mode, or can be disconnected.
You can set different modes for the TPS serial link and local RS-232 port.
Control Mode
The incoming data from the given port is processed and interpreted by the CPU. The mode allows to control
Command Injection Mode
local) for this purpose. E.g. the default Command Injection port number of the local RS-232 port is 8001. If
data is coming from the TPS interface which is addresses to the port no. 8001, it will be transmitted to the
Tx pin of the local RS-232 port. This also works in the opposite direction of course, and the method is the
same on the serial interface of the TPS port as well.
The following ways are available for controlling the devices:
▪ The System controller can send TCP messages to the IP:port address of the Matrix. In this case, the
control is one-way, the System controller sends commands to the HDTV. You can see the details about
TCP message sending in the Ethernet Message Sending section.
▪ The System controllerMatrix to the given port number. The
Matrix converts the incoming TCP messages to RS-232 commands and transmits over the local
RS-232 port to the HDTV. The local RS-232 port has to be set to Command Injection mode. In this case
the direction of the communication is bi-directional between the Matrix and the System controller, so
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