EV6240 Datasheet, PDF (32/47 Pages) CML Microcircuits – Opto-Isolated serial interface capability

Evaluation Kit for CMX624/CMX644A
EV6240
1.6.5.4 Modem Two Originating a Bell 202 Call to an External Simulator/Modem
Modem Two configured to dial out and detect Call Progress tones via the 2-wire line with DTMF tone
durations of 150ms.
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. Select Bell communications standard for Bell 202.
Command : ATB1<CR>
3. Set calling characteristic to detect dial tones and busy tones.
Command : ATX4<CR>
4. Set DTMF Tone Duration S-Register (S11) to 150ms.
Command : ATS11=15<CR>
5. DTMF Dial.
Command : ATD0176432198<CR>
Modem Two will begin the EV6240 Calling (Originate) Modem Handshaking Sequence when the dial
tone has been detected, DTMF tones transmitted and no busy tone is detected.
The OK result code returned to the PC after dialling indicates the handshaking sequence has begun.
NO DIAL TONE or BUSY result codes returned to the PC indicate that the dialling stage has failed
and the handshaking sequence has not been attempted.
1.6.5.5 Modem Two Transmitting Low Band PSK in Test Mode via a 2-Wire Line
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. Select Test Mode for simple diagnostic purposes.
Command : AT@E1<CR>
3. Set Focus to Modem Two.
Command : AT@M1<CR>
4. Write to CMX644A SETUP register (Relay Drive and 3.6864MHz xtal)
Command : AT@RE0=65<CR>
5. Write to CMX644A GAIN BLOCKS register (0dB Tx Gain)
Command : AT@RE2=240<CR>
6. Write to CMX644A TX PSK MODE register (TXON, Low Band and PSK Tx enabled)
Command : AT@RE7=66<CR>
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© 1999 Consumer Microcircuits Limited
UM6240/3