EV6240 Datasheet, PDF (31/47 Pages) CML Microcircuits – Opto-Isolated serial interface capability

Evaluation Kit for CMX624/CMX644A
EV6240
1.6.5.2 Modem Two Automatically Answering a V22 Call from an External Simulator/Modem
Modem Two configured to auto-answer on 10 consecutive BT rings via the 2-wire line.
The CMX644A will be configured to operate with 8 data bits, 1 stop bit and no parity.
Example assumes the evaluation board is powered up with CMX644A target devices inserted and with
the line select switches set to 2-wire and the crystal select switches set to 3.6864MHz.
1. Select CMX644A target devices for V22 or Bell 212A line Modulation.
Command : ATF1<CR>
2. Set Focus to Modem Two.
Command : AT@M1<CR>
3. Write to CMX644A UART MODE register, 8 Data Bits and 1 Stop Bit. UART MODE register Bit 5
(SYNC/ASYNC) will be overwritten during handshaking and data transfer.
Command : AT@RE4 = 8<CR>
4. Set Automatic Answer S-Register (S0) to 10 rings.
Command : ATS0=10<CR>
Modem Two will begin the EV6240 Answering Modem Handshaking Sequence when 10 consecutive
BT rings have been successfully detected on the 2-wire line.
1.6.5.3 Modem Two Manually Answering a V23 Call from an External Simulator/Modem
External Simulator/Modem sets up a call to Modem Two of the EV6240 evaluation board via the 2-wire
line.
Depending on the test set up a ringing signal will be present on the line or the Calling External
Simulator/Modem will be waiting for the 2100Hz Answer Tone.
The CMX624 will be configured to operate with 7 data bits, 2 stop bits and no parity.
Example assumes the evaluation board is powered up with CMX624 target devices inserted and with
the line select switches set to 2-wire and the crystal select switches set to 3.5795MHz.
1. Set Focus to Modem Two.
Command : AT@M1<CR>
2. Write to CMX624 SETUP register, 7 Data Bits and 2 Stop Bits.
All other SETUP register bit settings will be overwritten during handshaking and data
transfer.
Command : AT@RE0=9<CR>
3. Manually Answer V23 Call.
Command : ATA<CR>
Modem Two will go off-hook and begin the EV6240 Answering Modem Handshaking Sequence via the
2-wire line. This will start with a 2 second billing delay before transmitting the 2100Hz Answer Tone.
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© 1999 Consumer Microcircuits Limited
UM6240/3