Bus Protocol (External Load Management); Modbus Connection; Functions Supported By The Modbus Protocol; Checking Load Management - AMPERFIED Wallbox Energy Control Manual De Instrucciones

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5. Bus protocol (external load
management)
The M odbus RTU protocol is used for communi-
cation between the external control system and
the Wallboxes. Each Wallbox is ready to receive a
Modbus command only after more than 10 seconds
have elapsed since Power On. If the corresponding
Wallbox is in standby mode, it cannot be addressed
via Modbus.
5.1

Modbus connection

The Wallbox is connected to an external control
system using a two-wire RS485 bus (half-duplex).
Bus parameters used:
• Baud 19200 bit/sec,
• 8 data bits,
• 1 stop bit,
• 1 parity bit (even),
• Least significant bit sent first (LSB first).
Only unicast mode is supported as the addressing
mode.
Broadcast mode is not supported.
5.2 Functions supported by the Modbus
protocol
The Wallboxes support exclusively the following
functions:
• 03 (0x03) Read Holding Register
• 04 (0x04) Read Input Register
• 06 (0x06) Write Holding Register
• 16 (0x10) Write Multiple Register
The byte sequence is High byte before Low byte
(Motorola format).
The CRC checksum sequence is Low byte before
High byte (Intel format).
6.

Checking load management

Put the load management system into operation
after properly installing and configuring it.
i
When checking the load management system,
ensure that no vehicle is connected to any Wallbox.
• Establish the power supply for the Wallboxes in
local load management mode, beginning with
the leader Wallbox.
• Establish the power supply for all devices in
external load management mode, beginning
with the external control electronics.
• The front illumination of each Wallbox lights up
for 5 minutes and then goes out.
• Load management is now ready for operation.
22
Diagnosis of communication errors in the load
management system via the front illumination.
The front illumination flashes in the event of a fault.
Six brief white flashes. Pause, three long blue flashes.
Pause.
This flashing sequence indicates a communication
error between the leader Wallbox or the external
control system and the corresponding follower
Wallbox. Check whether the bus installation was
performed correctly. Once the fault has been
remedied and a self-test has been performed, the
front illumination lights up white and the charging
process can be requested. Please contact the
Hotline if the fault persists.