Accessing Mesa Models - Nuvation Energy S801 Product Manual

Model Block Point Name
803 Fixed BMaxStrCur
803 Fixed BMinStrCur
803 Repeat StrSoC
803 Repeat StrSoH
803 Repeat StrCur
803 Repeat StrMaxCellVol
803 Repeat StrMinCellVol
803 Repeat StrCellVolLoc
803 Repeat StrMaxModTmp
803 Repeat StrMinModTemp
803 Repeat StrModTmpLoc
803 Repeat StrEvt1
The term Index in the Repeating block addresses used in the above table refers to a

calculation of Index = Stack Index * Length of Repeating block. By definition, the 803
Repeating block is 16 Modbus registers in length.

7.1.5. Accessing MESA Models

MESA models are located contiguously in the Modbus address space starting at a base address of
40000. The Common Model is always located first in this space. The End Model is always last and is
used to denote the end of MESA Modbus registers. Each model located between the Common Model
and the End Model has a numeric identifier as well as a length. A handy tool that can be used to
explore the MESA Modbus registers for Nuvation Energy BMS is modpoll.exe. It is available for free
download at http://www.modbusdriver.com/modpoll.html.
Using modpoll.exe, the Common Model can be polled from a using the following command (assuming
the device has an IP address of 192.168.1.21)
Document ID: NE-PM-004
Nuvation Energy Multi-Stack Controller - Product Manual
Address Scale
Factor
40128 Yes
40129 Yes
40135 +Index No
40136 +Index Yes
40137 +Index Yes
40138 +Index Yes
40139 +Index Yes
40140 +Index No
40141 +Index Yes
40142 +Index Yes
40143 +Index No
40144 +Index No
57
Purpose
Largest DC current reported by a stack/string
Smallest DC current reported by a stack/string
State of charge for a stack/string
State of health for a stack/string
Current of a stack/string
Maximum cell voltage of a stack/string
Minimum cell voltage of a stack/string
Location of min/max cell voltages of a stack/string
Maximum module temperature of a stack/string
Minimum module temperature of a stack/string
Location of min/max module temperatures of a
stack/string
Alarms warnings and status bit field of a stack/string
Rev 2.0, 2022-05-18
Curie Update 3