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Connecting Arduino MKR ZERO with EmStat Pico (without Development board)

Hi

I have both a standalone EmStat Pico Module and a Pico EmStat Development board and a Arduino MKR ZERO microcontroller.

When I run our latest example code from Github: link using the development board I get consistent readings out:

13:09:26.978 -> Connected to EmStat Pico
13:09:26.978 -> 
13:09:26.978 -> Response begin
13:09:27.990 -> 
13:09:27.990 -> Measuring...
13:09:28.499 -> 
13:09:28.499 -> Receiving measurement response:
13:09:28.499 -> 1	E set[V]: -4.999E-01	I[A]: -4.990E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:29.011 -> 2	E set[V]: -4.497E-01	I[A]: -4.491E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:29.484 -> 3	E set[V]: -3.995E-01	I[A]: -3.987E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:29.997 -> 4	E set[V]: -3.493E-01	I[A]: -3.483E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:30.502 -> 5	E set[V]: -2.992E-01	I[A]: -2.985E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:31.015 -> 6	E set[V]: -2.490E-01	I[A]: -2.481E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:31.497 -> 7	E set[V]: -1.988E-01	I[A]: -1.977E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:32.006 -> 8	E set[V]: -1.486E-01	I[A]: -1.478E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:32.516 -> 9	E set[V]: -9.840E-02	I[A]: -9.744E-06	status: Underload        	CR: 1 mA (High speed)    	
13:09:32.996 -> 10	E set[V]: -4.821E-02	I[A]: -4.704E-06	status: Underload        	CR: 1 mA (High speed)    	
13:09:33.524 -> 11	E set[V]: 1.976E-03	I[A]: 2.240E-07	status: Underload        	CR: 1 mA (High speed)    	
13:09:34.011 -> 12	E set[V]: 5.216E-02	I[A]: 5.264E-06	status: Underload        	CR: 1 mA (High speed)    	
13:09:34.515 -> 13	E set[V]: 1.024E-01	I[A]: 1.030E-05	status: Underload        	CR: 1 mA (High speed)    	
13:09:35.029 -> 14	E set[V]: 1.525E-01	I[A]: 1.529E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:35.505 -> 15	E set[V]: 2.027E-01	I[A]: 2.033E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:36.011 -> 16	E set[V]: 2.529E-01	I[A]: 2.531E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:36.516 -> 17	E set[V]: 3.031E-01	I[A]: 3.035E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:37.023 -> 18	E set[V]: 3.533E-01	I[A]: 3.534E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:37.543 -> 19	E set[V]: 4.035E-01	I[A]: 4.043E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:38.013 -> 20	E set[V]: 4.537E-01	I[A]: 4.542E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:38.515 -> 21	E set[V]: 5.039E-01	I[A]: 5.040E-05	status: OK               	CR: 1 mA (High speed)    	
13:09:38.515 -> 
13:09:38.515 -> Measurement completed.
13:09:38.515 -> 21 data point(s) received.

However, when I run the same code and connect the standalone EmStat Pico to the Arduino MKR ZERO like this: image, I get this error output:

13:39:46.037 -> Connected to EmStat Pico
13:39:46.037 -> 
13:39:46.037 -> Failed to parse package: -5

which is not documented in the EmStat Pico communication protocol V1.2.

Can you please help me debug this issue, as I would like to understand and work with the protocol.