Huawei EMU, User Manual

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Table 2-2 lists the meanings of the pins of the RS485 serial port socket.
Table 2-2 Meanings of the pins of the RS485 serial port socket
PIN Meaning
1 NULL
2 RX1+: positive reception terminal of serial
port 1
3 TX1+: positive transmission terminal of
serial port 1
4 RX2+: positive reception terminal of serial
port 2
5 TX2+: positive transmission terminal of
serial port 2
6 RX1-: negative reception terminal of serial
port 1
7 TX1-: negative transmission terminal of
serial port 1
8 RX2-: negative reception terminal of serial
port 2
9 TX2-: negative transmission terminal of
serial port 2
NOTE
l
The signals shown in this table are defined in terms of transmission and reception by the EMU.
l
When the TXD+ pin is connected to the RXD+ pin and the TXD- pin is connected to the RXD- pin,
the RS485 serial port can be used for two-wire connection.
l
The EMU works properly even if only one RS485 serial port is connected. It is recommended that you
use two RS-485 serial ports in active/standby mode. In this case, set serial port 1 to the active port.
2.4.2 RS232 Serial Port
This describes the RS232 serial port on the EMU. An RS232 serial port is an RJ-45 socket and
suitable for a dedicated serial port cable that has an RJ-45 plug.
For the position of the RS232 serial port on the EMU, see 2.2 Exterior of the EMU .
Figure 2-7 shows pins of the RS232 serial port socket.
Figure 2-7 Pins of the RS232 serial port socket
2 Overview of the EMU
EMU
User Guide
2-8 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 13 (2009-12-30)