Huawei MTS9300A - Page 45

Table 3-19 Pin denitions of communications ports
RJ45 Pin Signal Description Remark
1 RS485 T+ RS485 transmission + Four-wire RS485
communications, complying
with the Modbus protocol
2 RS485 T- RS485 transmission –
3 NC Reserved
4 RS485 R+ RS485 reception +
5 RS485 R- RS485 reception –
6 NC Reserved -
7 CANH Positive terminal for
CAN communications
Used to report alarms to a
monitoring unit and
exchange data between
ESMs connected in parallel.
8 CANL Negative terminal for
CAN communications
DO1 and DO2 Ports
Table 3-20 DO1 and DO2 port
denitions
Silk
Screen
Denition Description Alarm
Status
DO1 Fault, major
alarm
If the ESM raises one of the following
alarms, the dry contact supplies an
alarm signal:
Cell voltage sampling fault, cell
temperature sampling fault, charge
converter output short circuit, relay coil
short-circuit, charge low temperature
protection, discharge low temperature
protection, charge high temperature
protection, discharge high temperature
protection, power module internal
overtemperature protection, discharge
converter output short circuit, input
reverse connection, BMU anti-theft lock,
overload lockout due to component
failure, serial number
conict, serial
number
conict, input/output discharge
overvoltage lockout, and discharge
overcurrent lockout
Congurabl
e (If the dry
contact is
closed, an
alarm is
reported by
default.)
MTS9300A Telecom Power (Ooredoo, Indonesia,
MTS9304A-HD2002)
User Manual 3 Components
Issue 06 (2021-10-13) Copyright © Huawei Technologies Co., Ltd. 39