diff --git a/hermes_eea/data/hermes_EEA_sci_packet_def.csv b/hermes_eea/data/hermes_EEA_sci_packet_def.csv
new file mode 100644
index 0000000..8c505af
--- /dev/null
+++ b/hermes_eea/data/hermes_EEA_sci_packet_def.csv
@@ -0,0 +1,10 @@
+name, data_type, bit_length
+SHCOARSE, uint, 32
+SHFINE, uint, 20
+SHFILL, fill, 4
+SHEID, uint, 8
+STEP, uint, 8
+COUNTER1, uint, 16
+COUNTER2, uint, 16
+ACCUM, "int(34)", 12
+CKSUM16, uint, 16
\ No newline at end of file