Serial port

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The HMP features a 3-pin RS-232 serial port interface which can be used to send / receive commands to / from external devices compatible with the RS-232 serial communication standard. Most professional monitors also support the RS-232 standard for switching on / off operation mode and other configurations.

The communication through the serial port is usually governed by a serial port protocol file. The HMP comes with four built-in protocol files - for LG LF65, Panasonic plasama and Sharp Aquos screens, plus one for NMEA-0183 standard - and also allows uploading custom protocol files with the appropriate commands supplied by the device manufacturer.

"Technical note"
Starting with the 3.0 firmware release, it is possible to write and read from the serial port using the JavaScript COM API.


The settings related to the RS232 port can be found within Control Center, on the

Note that in firmware versions prior to 3.1, the serial port is disabled by default - in can be enabled by activating a serial port protocol file or by activating the "Enable display power saving" option from "Display Settings" page > "Power Save" tab.

RS232 cable


The HMP employs a 3.5mm TRS jack for RS232 interface (to save space on the panel), which can withstand any voltages up to -25/+25V and drives output voltage levels between -5V/+5V.

A compatible cable can be purchased from SpinetiX or it can be created with the wiring detailed on the right.


Here is a list of known problems:

  • Sometimes the 2nd and 3rd pins (see the diagram below) on the projector / screen might been inverted regardless of the screen documentation (as experienced with the Panasonic devices) - in this case a male-male / male-female 9p null modem adapter (or cable) should be used after the SpinetiX cable.
  • Sharp Aquos monitors are known to turn OFF the RS232 receiver when the PowerOff command is received. Some versions have a "hotel mode" that can be enabled to prevent this (contact your screen manufacturer or reseller to see if your screen has this feature and how to enable it). Alternatively, you can send a "RSPW1" command to the screen which tells the screen to respond to PowerOn commands when it's turned off.
This page was last modified on 22 March 2016, at 14:06.