Table 2-3 lists the meanings of the pins of the RS232 serial port socket.
Table 2-3 Meanings of the pins of the RS232 serial port socket
PIN Meaning
1 NULL
2 NULL
3 TX: transmit terminal
4 GND: signal grounding terminal
5 GND: signal grounding terminal
6 RX: receive terminal
7 NULL
8 NULL
NOTE
l The signals shown in this table are defined in terms of transmission and reception by the EMU.
l The RS232 serial port is a standby commissioning port. When the EMU works properly, this port is
not used.
2.5 Monitoring Ports of the EMU
The EMU provides monitoring ports for the humidity/temperature sensor, smoke sensor, water
sensor, infrared sensor, and door status sensor. In addition, the EMU provides monitoring ports
for the Boolean signal sensor, analog signal sensor, and output control sensor, which are extended
sensors.
2.5.1 Monitoring Port for the Water Sensor
This describes the monitoring port for the water sensor. This port is a voltage-type Boolean
signal monitoring port and suitable for a bare terminal of a cable (24 AWG - 12 AWG).
2.5.2 Monitoring Port for the Smoke Sensor
This describes the monitoring port for the smoke sensor. This port is a current-type Boolean
signal monitoring port and suitable for a bare terminal of a cable (24 AWG - 12 AWG).
2.5.3 Monitoring Port for the Infrared Sensor
This describes the monitoring port for the infrared sensor. This port is a voltage-type Boolean
signal monitoring port and suitable for a bare terminal of a cable (24 AWG - 12 AWG).
2.5.4 Monitoring Port for the Door Status Sensor
This describes the monitoring port for the door status sensor. This port is a dry contact point
Boolean signal monitoring port and suitable for a bare terminal of a cable (24 AWG - 12 AWG).
2.5.5 Monitoring Port for the Humidity/Temperature Sensor
EMU
User Guide 2 Overview of the EMU
Issue 13 (2009-12-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2-9
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