£40 – Sonifex DHY-03 Module
What does it do?
Controls a Sonifex DHY-03 Telephone Interface. This module has full two-way RS232 communication showing realtime state of the telephone line, and also has an integrated dialer. Push the digit,* and # inputs and build up a number to call, press Backspace to delete a character at a time or Clear to start again. Individual Dial, Hangup and Answer buttons.
Also has a comms_OK digital output which goes high when comms are established, and goes low if the unit ever stops responding or the cable is removed/damaged.
Two-way RS-232 with adjustable poll durations.