diff --git a/PSSS-PID-check.md b/PSSS-PID-check.md
new file mode 100644
index 0000000..29ba69f
--- /dev/null
+++ b/PSSS-PID-check.md
@@ -0,0 +1,7 @@
+# Checking offset and error in pulse ID
+
+An LED installed in front of the PSSS camera which runs a sequence (not currently maintained after a power cycle).  To turn on/off sequence:  
+
+- on: `caput SGE-CPCW-73-EVR0:FrontUnivOut0-Ena-SP 1`
+- off: `caput SGE-CPCW-73-EVR0:FrontUnivOut0-Ena-SP 0`
+![image](uploads/a2830096617e94faa61abf7c38148723/image.png)
\ No newline at end of file