On the test, I have OLT Huawei SmartAX MA5683T and EPS30-4815AF power supply.
Connect them with a regular twisted pair patchcord with RJ45 connectors.
From the OLT side, we connect the cable to the ESC port on the control board, and on the EPS30-4815AF to RS485.
After this, the OLT will be able to send commands to the EPS30-4815AF.

RS232 port is active by default, and RS485 is reserved, they cannot be used at the same time.

Open the OLT console and add EPS30-4815AF:

emu add 1 POWER4830L 0 0 4815AF

On the EPMU03 monitoring module, it is necessary to set the DIP switches correctly, for example, enable 1 and 2, turn off the rest (this will result in subnode id 3), 6 DIP determines the speed if 9600 bit/s is enabled, if 19200 bit/s is disabled. By default, only 6 DIPs are enabled, and the rest are disabled. 7 and 8 DIPs are reserved, they are always off.

If the required model is not in the list, you can choose a similar one, as I did, for example, instead of 4815AF I chose POWER4830L, at the end of the line 4815AF is just a note.

On the old version of MA5683T, it was impossible to specify the baud rate, by default it was 19200, so I turned off all DIP and the connection was successful.

Now let’s move on to managing added emu:

interface emu 1

Let’s look at the current parameters:

display power system parameter
display power environment parameter

Using the question mark “?” you can watch the available commands and subcommands.

The standard settings were 100Ah and a battery test every 60 days.
With the following command, I changed the period to 30 days and the battery capacity to 26Ah (as they were going to connect four batteries in series to 12V / 26Ah which were idle):

power battery parameter 0.15 30 1 26

After the settings, we’ll exit the emu 1 interface settings and save the configuration:


I will show some commands with information:

display emu 1
  EMU ID: 1
  EMU name    : 4815AF
  EMU type    : Pwr4830L
  Used or not : Used
  EMU state   : normal
  Frame ID    : 0
  Subnode     : 0
interface emu 1
display version
  EMU ID: 1
  Software version          : 1400
display power environment info
display power run info
  EMU ID: 1                             System run information
  Limit State      : No limit   Charge control    : Automatic control
  Charge state     : Floating
  Load-off-permit  : Forbid     Battery-off-permit: Permit
  Module number    : 2
  Module 0 address : 1          Module 0 type     : 0
  Module 1 address : 2          Module 1 type     : 0
  Module 2 address : No configured   Module 2 type     : No configured
  Main voltage     : 53.57V     AC voltage        : 219.99V
  Module current   : 6.75 A
display power alarm
  EMU ID: 1                             Power alarm information
  Mains supply yes : Yes            Mains supply lack : Normal
  Total Vol lack   : Normal
  Load fuse 0      : Connect        Second fuse       : Connect
  Load off         : On             Battery off       : On
  Module 0         : Normal
  Module 1         : Normal
  Module 2         : Normal
  Door alarm       : Alarm          Water alarm       : Normal
  Fog alarm        : Normal         Wiring alarm      : Normals
  Environment Temperature       : Normal  Environment Humidity       : Normal
  Battery temperature off state : Normal  Load temperature off state : Normal
  Name                            State |Name                            State
  Spare Dig0                      Normal|Spare Dig1                      Normal
  Spare Dig2                      Normal|Spare Dig3                      Normal
  Spare Dig4                      Normal|Spare Dig5                      Normal
  Spare Dig6                      Normal

Example for removing emu:

emu del 1

The EPS30-4815AF power supply has two independent rectifier modules GERM4815T, which is more reliable, for example, if the RUN indicator on one of them stops illuminating, the module must be replaced. In 2021, in China, GERM4815T was $36, EPS30-4815AF for 15A – $150, and for 30A – $180, + shipping and customs clearance. The MA5608T has an input current of 10A DC and 6A AC.

See also my article:
Configuring Huawei SmartAX MA5683T via the console

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    1. On the EPMU03 monitoring module, it is necessary to set the DIP switches correctly