  The CALICE Semi-Digital Hadronic Calorimeter (SDHCAL) prototype, built in
2011, was exposed to beams of hadrons, electrons and muons in two short periods
in 2012 on two different beam lines of the CERN SPS. The prototype with its 48
active layers, made of Glass Resistive Plate Chambers and their embedded
readout electronics, was run in triggerless and power-pulsing mode. The
performance of the SDHCAL during the test beam was found to be very
satisfactory with an efficiency exceeding 90% for almost all of the 48 active
layers. A linear response (within 5%) and a good energy resolution are obtained
for a large range of hadronic energies (5-80GeV) by applying appropriate
calibration coefficients to the collected data for both the Digital (Binary)
and the Semi-Digital (Multi-threshold) modes of the SDHCAL prototype. The
Semi-Digital mode shows better performance at energies exceeding 30GeV
