You'll see something like this :
Hw:d1.6 7/1/06------------Hardware Issue and date
Sw: 4197a/o 15/7/04----------Software issue and date
DD:3.0/6.0 Code 008/03--??
Ls:7F000000 MS4200--??
DIMMV 12.9/5.8/5.4---------------------The dashboard illumination level
LCD:34*c u30:14.0v---LCD preheated air inlet temperature U:30 is the Battery Volts
SENS:19.0 V

t:62---SENS:?? V:Velocity in km/Hr t: engine water temp
Tc:880.01 10.5/10.9/11.4---Fuel Consumption instantaneous, medium term and long term average Voltages
Rc:880.01 5.9/9.4/7.9-------Fuel Consumption instantaneous, medium term and long term average Voltages
BUS:00000-----------------
Warn:00000---------------Suspect these are associated with Fault Codes
Ack:00000----------------Suspect these are associated with Fault Codes
Store:00000--------------Suspect these are associated with Fault Codes
RDS-T;20:51--------------RDS Time Signal eg 8:51 pm
P1-ehv oc----------------- Suspect this might be the exhaust valve
associated with the Carbon Dust recycling/dpf regeneration.
Alternatively Electrohydraulic valve associated with VVT
There is a plethora of information you can get from it but it's not guaranteed on all Zaffs.
Good luck.