Add Kiethley serial port configuration from Echidna

site_ansto/instrument/config/environment/sct_keithley_2700.tcl

@@ -2,6 +2,17 @@
 # MakeSICSObj $obj SCT_<class>
 #  The MakeSICSObj cmd adds a /sics/$obj node.  NOTE the /sics node is not browsable.
 
+# Moxa RS232 configuration
+# Port 3
+# Baud rate                      : 9600
+# Data bits                      : 8
+# Stop bits                      : 1
+# Parity                         : None
+# Flow control                   : XON/XOFF
+# FIFO                           : Enable
+# Interface                      : RS-232
+
+
 
 namespace eval ::scobj::k2700 {
 # Environment controllers should have at least the following nodes