USER MANUAL
SAJ SOLAR INVERTER
35
36
Pin Number
Description
Function
2
3
4
1
+5V
Power supply
Send data
Receive data
Ground wire
RS-232 TX
RS-232 RX
GND
Single inverter terminal block connection:
Multiple inverter terminal block connection:
USB interface could be externally connected with eSolar WiFi /4G/AIO3
communication module, for operation in details please refer to communi
-
cation module Quick Installation Guide in https://www.saj-electric.com/.
Pin
name
Function
B1
PE
A1
B1
PE
A1
RS485-A+
RS485 in, RS485A differential
RS485 in, RS485B differential signal -
GND, shielded earthing point
RS485 in, RS485A differential
RS485 in, RS485B differential signal -
GND, shielded earthing point
RS485-B-
PE
RS485-A+
RS485-B-
PE
Terminal block:
Note: When there are multiple inverters connected, please connect a ter
-
minating resistor between A1 and B1 by switching the RS485 DIP switch,
to ensure the communication quality.
A1 B1 P1 A1 B1 PE
A2 B2 PE A2 B2 PE
RS485_1
A2 B1
PE A1 B1
PE
A2 B1
PE A1 B1
PE
A1 B1
PE A1 B1
PE
5.7
RS232/USB Connection
Figure5.24
RS232 pin
Table 5.11
USB pin port definition
Table 5.10
Terminal block description
Fig 5.21
RS485 terminal block
Fig 5.22
Single inverter terminal block
Fig 5.23
Multiple inverter terminal block