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serial.md

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Serial Interface

Getting Started

  1. Connect the Powermeter via USB to your PC
    • both under Windows and under Linux, a virtual serial port should be detected without drivers needed
  2. Connect to the virtual serial port e.g. with PuTTY, or e.g. with the screen command

UI Mode

Press the Esc key to enter UI mode.

-35.103 dB

          v
| ' | ' | ' | ' | ' | ' | ' |

Cnt  Avg 16  3000 MHz

Valid commands:

  • a: enter number of averages (must be a power of 2, in the range 1..512)
  • c: continuous trigger mode
  • d: display diagnostic data
  • t: trigger a single measurement
  • f: enter frequency in MHz (for compensation data; must be in the range 10..8000)
  • h: display help
  • l: turn compensation on/off
  • Esc: re-draw the screen

Remote Mode

Send a \0 character (i.e. ASCII code zero) to enter remote mode. All commands and responses are terminated by \n (i.e. ASCII code 10) Valid commands:

  • a<int>\n: set number of averages
    • Must be a power of two
    • E.g. a32\n to set 32 averages
  • d\n: diagnostics
    • Returns three semicolon-separated list of three values: the measured voltage of 5V0USB (USB bus voltage) in volts, the measured voltage of 5V0A (analog supply) in volts, and the tmeperature sensor reading on °C
    • E.g. d\n → 4.999;5.010;32.105\n
  • e\n: get last error
    • Returns an error code that is zero in the case of no error.
    • E.g. e\n → 0\n
  • f<int>\n: set frequency, in MHz
    • Must be in the range 10..8000
    • E.g. f1100\n to set to 1.1 GHz
  • l<int>\n: enable/disable compensation
    • Must be 1 (enable) or 0 (disable)
    • E.g. l1\n to enable compensation
  • m<r|w><hex><hex>\n: access EEPROM
    • Read from memory: send r, followed by exactly four hexadecimal digits (address); the response will be exactly four hexadecimal digits (data)
    • Write to memory: send w, followed by exactly four hexadecimal digits (address), followed by exactly four hexadecimal digits (data)
    • E.g. mw00010002\n to write 0x0002 to address 0x0001
    • E.g. mr0001\n to read from address 0x0001 → e.g. 0002\n
  • t\n: trigger a measurement
    • Ehe response will be sent as a signed floating-point string, followed by \n
    • E.g. t\n → -30.205\n
  • \0: enter remote mode