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ESM-2740/2743
38 ESM-2740/2743 User’s Manual
2.4.7.4 PS/2 Keyboard and Mouse Signals
Signal Signal Description
KBDAT Bi-directional keyboard data signal.
KBCLK Keyboard clock signal.
MSDAT Bi-directional mouse data signal.
MSCLK Mouse clock signal.
2.4.7.5 Serial Port Signals
Note that all serial port signals on ESM-2740/2743 connectors are logic level signals.
External transceiver devices are necessary for the conversion of the logic level signals to
the desired physical interface such as RS232, RS422, or RS485.
Signal Signal Description
DTR1#, DTR2#
Active-low data terminal ready outputs for the serial port. Handshake output signal
notifies the modem that the UART is ready to establish a data communication link.
RI1#, RI2#
Active-low input is for the serial port. Handshake signals notify the UART when a
telephone ring signal is detected by the modem.
TXD1, TXD2 Transmitter serial data output from serial port.
RXD1, RXD2 Receiver serial data input.
CTS1#, CTS2#
Active-low input for serial ports. Handshake signals notify the UART when the
modem is ready to receive data.
RTS1#, RTS2#
Active-low output for serial port. Handshake signals notify the modem when the
UART is ready to transmit data.
DCD1#, DCD2#
Active-low input for serial port. Handshake signals notify the UART when a carrier
signal is detected by the modem.
DSR1#, DSR2#
This active-low input is for serial port. Handshake signals are use to notify the
UART that the modem is ready to establish the communication link.
2.4.7.6 VGA Signals
Signal Signal Description
HSY
Horizontal Sync: This output supplies the horizontal synchronization pulse to the
CRT monitor.
VSY
Vertical Sync: This output supplies the vertical synchronization pulse to the CRT
monitor.
R, G, B
Red, green and blue analog video output signals for CRT monitors. These lines
should be terminated with 75 ohms to ground at the video connector.
DDCK, DDDA
These two pins can be used for a DDC interface between the graphics controller
chip and the CRT monitor.