I have a WS-500 Pro with the latest version (2.6.1) of firmware as well as a ABMS with the latest version (2.9.7) of firmware. I'm trying to get the CAN communications working between the two without errors.
The problem I'm having is that the WS-500 is reporting an error about a missing BMS connection. The indicator lights will single flash green twice, then 4 single flashes of orange, then a bunch of red flashes. This sequence repeats. Reading from the manual, orange flash indicate CAN communications. I have pulled out the CAN cable and confirmed that I don't get any orange flashes. They return if I plug the cable back in.
I can confirm that the WS is can report the battery voltage and battery temperature on the monitor screen intermittently, but the temperature gauge flashes "missing" just about when the red lights flash.
I have termination on the BMS end of the cable (only 36" long) and a termination plug in the second CAN port on the WS-500. The monitor page of the WS-500 does not report any CAN errors.
CANS on the ABMS is set to 2. REC Active BMS is selected in the WS-500. I have reset the WS-500 to initial defaults with the only change is selecting the BMS type.
I have checked the wiring many times. I even patched in a CAN network analyzer and captured valid message from both devices.
The Wakespeed app reports this error:
=== FAULT DETAILS ===
Code: 42
Title: Missing Required Sensor/Device
Short Description:
A necessary sensor or device is missing or not connected. Check wiring and sensor presence.
Missing sensors:
• BMS connection via CAN
Detailed Description:
A sensor or device that is required for proper operation. This could be due to a loose connection, damaged sensor, or incorrect configuration.
Recommended Action:
* Inspect all wires and sensors to ensure they are properly connected.
* Verify the Wakespeed device's configuration to identify the missing sensor.
* Replace any damaged or faulty sensors.
=== ADDITIONAL INFO ===
Timestamp: 2026-01-11 13:27:47.273807
Status: Requires attention
Auto Restart: No
Related Codes: 42
=== CONFIGURATION INFORMATION FOR SUPPORT ===
AST;,0.00, ,0.00,0.9,0.9,0, ,14.20,126,15000,10, ,-99,23, ,0, ,13.11,23,-1.0,0
CPE;,8,14.20,0,0,0, ,0,0,0.00,0, ,0.00,0,0,0,-50,13.00, ,0,0.00,0, ,0.00,0,0,0, ,0.000,0,5,45, ,0.00,7,42,25,70, ,200, ,0.00,0.00
NPC;,1,POWERLINE,, ,2028, ,2025/10/14
SST;,AREG2.6.1-PRO, ,0,1, ,8,0.63,1.00, ,0,0, ,0,0, ,1,0, ,0
SCV;,0,0,0,0.00,0.63,8, ,100,1.00,0.75,0.50,0, ,0,0, ,14,2.388,10000, ,0,0,30,15,0.00,0,0,16,0, ,150,0
CST;,1,1,1,70, ,1,1, ,0,0,0, ,0,0,3, ,128, ,0,0,0,0, ,0,0, ,0,0
ENG;,0.00, ,3200,0.10,0.20,0.40,1.00,1.00,1.00,0.95,0.50, ,0
AOK;
FLT;,14,0
RST;
..FLT;,42,8
..AST;,0.00, ,13.15,0.8,0.8,10, ,14.20,126,15000,10, ,-99,22, ,0, ,13.15,22,-1.0,0
..CST;,1,1,1,70, ,1,1, ,1,0,0, ,0,0,3, ,128, ,0,0,0,0, ,0,0, ,42
NAK;
Any ideas what could be wrong.
Thanks
