DAViD GD-04D DTMF module
The DAViD GD-04D DTMF module allows relay X and Y control by entering numeric codes (DTMF - Dual Tone Multi-Frequency codes) on the telephone keypad during calls.
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GD-04D DTMF
The GD-04D DTMF module allows relay X and Y control by entering numeric codes (DTMF codes) on the telephone keypad during calls. First call David’s tel. number and wait until the beep response, then enter the DTMF code and finally terminate the call. The module can be installed by plugging it into the appropriate digital bus.
