External Communication Connection - Growatt WIT 50K-A User Manual

Fig 6.8 BMS-COM communication terminals
Ttable 6.4 Battery communication terminal description
Definition of battery communication terminal
Number Definition of signal
1 Wakeup+
2 Wakeup-
3 RS485A3
4 RS485B3
5 CANH
6 CANL
7 CAN.GND
8 DI1
9 DI2
10 NA
11 NA
12 NA
13 NA
14 NA
15 NA
16 PE
35
BMS-COM
Note
Battery wake up signal
The PCS communicates with the battery via
RS485
The PCS communicates with the battery via
CAN
Battery shutdown input signal
NA
Grounding
BMS-COM
PCS
Fig 6.9 BMS-COM communication connection

6.5.2 External Communication connection

NOTE:
When connecting external devices, such as the PC, please use isolated communication
devices.
The external communication terminal of the WIT Inverter is a 16-pin connector. The
matching terminal is in the accessory kit. The connection procedure is as follows:
1. Connect the communication cable to the corresponding terminal as required. For
details, see Table 6.5;
2. Remove the dustproof cover from the COM1 terminal and insert the 16-pin terminal
(the client side) to the corresponding position;
Fig 6.10 External communication terminal
Wakeup+
Wakeup-
RS485A3
RS485B3
CANH
CANL
CAN.GND
DI2
DI1
PE
COM1
36