Pylontech KH-ES4850 Owner's Manual page 14

Dry Contact
IN+/GND Input, passive signal. On: turn off battery. Off: normal.
Com/No1 Output1. On: stop charge.
Com/No2 Output2. On: stop discharge.
Com/No3 Output3. On: BMS error.
Output request signal voltage ≤25V
CAN
500 Kbps. 120Ω recommended. For connection to LV-HUB, inverter.
9600 or 115200 bps.120Ω recommended. For connection to inverter.
RS485/ CAN port
for communication between multiple parallel batteries.
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