Hach sc200 - Ptt; Ring

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Ring
When ringing is detected on the telephone line, the Ring LED illuminates. Since answering the telephone is a low
priority task to the B1290, it may ignore the ringing if it is processing other tasks (e.g. speaking on the radio).
PTT
The PTT LED will light when the B1290 generates a push-to-talk signal to the radio.