Overview Of Communications Card - Delta M88H_121 (ST) Quick Installation Manual

The connections for RS485, the digital inputs, the
dry contacts and the external power-off (EPO) are
all on the communication card. This means that
the installation work can be combined.
1
3
1 2 x dry contacts (terminal box)
2 DIP switch for RS485 termination resistor and VCC
3 Digital inputs and external power-off (terminal block)
4 RS485 (terminal block)
5 Protection against electromagnetic interference (EMI)
Quick Installation Guide for Solar Power Inverter M88H EU V3 EN 5013240202 02 2018-03-22
2
4 5

Overview of communications card

Connecting a PC via RS485
If you wish to use a PC with the Delta Service Software for set-
ting up the inverter you will need a USB/RS485 adapter in order
to connect the PC to the inverter.
Inverter
DATA+ Terminal 3 or 5
DATA– Terminal 4 or 6
NOTICE
Unwanted currents.
Unwanted currents can flow when multiple
inverters are connected via RS485.
► Do not use GND and VCC.
► If the cable shield is used for providing
lightning protection then the housing of only
one inverter in the RS485 chain should be
grounded.
USB/RS485 adapter
D+
D–
45