EV6240 Datasheet, PDF (5/47 Pages) CML Microcircuits – Opto-Isolated serial interface capability

Evaluation Kit for CMX624/CMX644A
EV6240
1.3 Quick Start
This section provides instructions for users who wish to experiment immediately with the evaluation
kit. A fuller description of the kit and its use appears later in this document.
1.3.1 Setting-Up
THE EV6240 COMES PRE-CONFIGURED WITH TWO CMX624 EVALUATION DEVICES FOR
OPERATION AT 5.0 VOLTS OVER A 2-WIRE LINE AND TO BE CONTROLLED VIA A NON-
ISOLATED PC INTERFACE.
RJ11 (US style) phone jacks are provided for 2-wire and 4-wire connections. Power is connected via
the two-way socket, J1.
Attach the 9-way RS232 cable between connector J2 and the serial port of the PC. Connect a line
simulator/external modem via one of the 2-wire line RJ11 connectors.
1.3.2 Adjustments
No board adjustments are required by the user. Telco-specific components may be added, as
required.
1.3.3 Operation
Each Modem is provided with an off-hook dc load, R20 (Modem One) and R48 (Modem Two). The
factory-fitted value is 2k2Ω so that line simulators know when the modem has gone off hook. This
resistor may be removed or an alternative value substituted. Line impedance (ac) matching is
provided by T1, R26 (Modem One) and T4, R54 (Modem Two).
The modems are controlled by the AT command set, described in Section 1.6.3, by running a terminal
emulator program on the host PC. A suitable emulator is the ‘Hyper Terminal’ program which
operates under Windows ’95 or NT systems.
There are two modes of operation for the Evaluation Kit:
Modem Mode allows one of the evaluation board modems to perform calling, answering and simple
data transfer with a line simulator or external third party modem (not supplied).
Test Mode allows diagnostic and performance tests to be made on Modem One and/or Modem Two.
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© 1999 Consumer Microcircuits Limited
UM6240/3