Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page 19
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2.3.11 RS-232 interface
The MAC1100/1200 has an RS-232 interface accessible with a 9-pin Sub-D
connector.
Except for the RS-232 driver chip, the interface is integrated into the control core of
the MPC821.
The interface has the following attributes:
hardware handshake with the signals RTS and CTS
or software handshake with XON/XOFF
transmission speeds from 4800 ... 38400 Baud
maximum input voltage range: +/- 15V
minimum driver output voltage: +/- 5V
maximum ESD interface protection: +/- 10kV
From version V1.1, MAC1100/1200 additionally provides a remote start input on the
RS-232 interface. The MAC1200 US device additionally provides a modem power
supply output on the RS-232 Interface.
2.3.12 Buzzer
The buzzer is an integrated signal generator with fixed frequency, directly operating
from the +5V logic power supply.
Activating and deactivating is controlled with the signal SPEAKER.
2.4 PCB Modem Supply CS_M
PCB Modem Supply CS_M generates a supply voltage of +8V dc, to operate a
special GE marquette modem direct on the RS-232 interface on the MAC1200
without the need of an external power supply for the modem.
The Voltage is generated by a switching regulator with current limit and thermal
protection from the +26,5V.
The modem supply voltage +8V is accessible on Pin 6 of the RS232 interface.
The protection against ESD is realized with a Transzorb diode on the PCB Control
CS_CI
.
2.5 Internal interfaces
2.5.1 Mechanical interfaces
Mechanical interfaces are described in Section “1.2 Mechanical Components“.
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