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 parameters were 100Ah.
With the next command, I changed the battery capacity to 26Ah and charge factor by 0.10 (as they were going to connect four batteries in series to 12V / 26Ah which were idle):

power battery parameter 0.10 60 1 26

We multiply the battery capacity by the charge factor and get the maximum charge current 26Ah*0.10=2.6A.

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

I will give another example of connecting EPS30-4815AF with MA5608T on the one hand, we will connect the standard ethernet pinout connector to the MCUD1 port CONSOLE/ESC, and on the other hand to the power supply in the RS232 port with the pinout as I showed in the table on the right:

1 (white-orange)7 (white-brown)
2 (orange)8 (brown)
3 (white-green)
4 (blue)1 (white-orange)
5 (white-blue)2 (orange)
6 (green)4 (blue)
7 (white-brown)
8 (brown)

Since the first 1 and 2 DIPs were enabled in the EPMU03 module, this turns out to be subnode 3, now we will execute the command on the OLT:

emu add 3 Power4830L 0 3 "EPS30-4815AF"
display emu 3
interface emu 3
display power system parameter
  EMU ID: 3                           Power system information
  Charge control state: Automatic control
  Equalizing voltage  : 56.50V      Floating voltage      : 53.50V
  Charge Lmt quotiety : 0.15        Equalizing time       : 60 days
  Battery number      : 1           Battery 0 capacity    : 65  AH
  Batt_temp_test_upper: 80 C        Batt_temp_test_lower  : -20C
  Batt_temp_Alam_upper: 50 C        Batt_temp_Alam_lower  : -15C
  Temp redeem quotiety: 80mV
  Batt temp Monitor   : Enable
  AC over alarm voltage : 280V      AC lack alarm voltage : 180V
  DC over alarm voltage : 58 V      DC lack alarm voltage : 45 V
  Power module number : 0
  Load off permit     : Forbid      Load off voltage      : 44.00V
  Battery high-temperature-off permit     : Permit
  Battery high-temperature-off temperature: 53 C
  Battery-lack-voltage-off-permit  : Permit
  Battery-lack-voltage-off voltage : 43.00V
  Battery barcode : -

Since the batteries were 60Ah and not 65Ah, I changed:

power battery parameter 1 0.10 60 60

Also indicated the date of installation of the batteries:

power batteryinstall 2021-05-01
display power batteryinstalltime

Let’s save the configuration:


Usually if the speed is set correctly, the OLT itself can detect the EMU, add it and report it to the terminal (the default speed is 19200):

emu baudrate 9600
Autofind an EMU, FrameID: 0   EMUID: 1    Type:Pwr4830L

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 articles:
Setting up ETP4830 A1 with Huawei OLT
Configuring ETP48100-B1 with Huawei OLT
SNMP MIB/OID for Huawei ETP4830
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