Powermaster, how to read data via RS232

powermaster

The “Power Master” is a digital RF power meter produced by Array Solutions. The coupler is separated from the display, useful when the amplifiers are away from the shack.

It has a RS-232 DB9 plug and can be connected to a serial port of the personal computer to read the FWD/REV Power and SWR with his control panel software called “Power Master Basic”.

Unfortunately this software runs only in Windows, if one needs to read the data in Linux or OSX (or in Windows with custom software) the Power Master’s RS232 port has to be activated, then the power can be easily read, parsing the ascii string coming out from the wattmeter.

To enable reading via the serial port, the undocumented command is:

0x02 0x44 0x31 0x03 0x43 0x30 0x0d 0x53 0x00

Total 9 bytes, the numeric notation 0xNN indicates an 8-bit value expressed using hexadecimal format.

When this command is received, the Power Master starts to send the data (example for 128W forward power and 1.11 SWR) :

(0x02)D,128,0, 1.11,0;0;0;0;0(0x03)4C

Hope this helps.


This morning good opening on 50MHz with East, heard some JA stations and worked a new country: Malaysia.

9M2TO_IW0FFK

9M2TO in OJ05 #194

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