Dry contact Port (DO) on battery , any idea what they are for?

[magnet creek]

My Sunpal 48V 200ah Batteries use a PACE BMS that has 4 dry contact ports on the front. I have seen them on a lot of server rack batteries.
I have never used these contacts (I use the CAN connection to the inverter and the RS232 to connect to Solar Assistant) but I'm curious.
I have tried to look for information on what the protocol is on these contacts but I can't figure it out. (https://www.akkudoktor.net/wp-conte...9718/71811=11470-PACE-16S-100Ah______-__.pdf_ )

Any Ideas?

 

[hwy17]

Dry contact relays are used for controlling external devices.

They are called "dry" because they supply no power. They act like a switch. When they are off, the two terminals are open and unconnected, when they are on the two terminals are closed and connected.

 

[magnet creek]

I understand the concept of Dry Contacts, it's basically binary code :"OPEN"-0 OR "CLOSED" -1.
So with 4 terminals on the server rack battery , you can basically create 16 "messages", or communicate different states.
I wonder if somebody knows what these messages are, I assume they are somewhat universal in the battery world.

 

[Spunky]

I understand the concept of Dry Contacts, it's basically binary code :"OPEN"-0 OR "CLOSED" -1.
So with 4 terminals on the server rack battery , you can basically create 16 "messages", or communicate different states.
I wonder if somebody knows what these messages are, I assume they are somewhat universal in the battery world.

Or what settings dictate their condition.

 

[magnet creek]

Never "played" with BMS tools, can you assign certain signals to the dry contact in BMS tools?