--- a/rsib.py	Sat May 16 23:35:22 2009 +0930
+++ b/rsib.py	Wed Aug 10 12:49:15 2011 +0930
@@ -75,7 +75,7 @@
 MSG_HELLO = 0x40   # We send this on connect
 MSG_CMDREP = 0x80  # Reply from the instrument to us
 MSG_CMD = 0x90     # Command to the instrument
-
+MSG_SRQ = 0x91	   # Query SRQ
 import socket
 
 class RSIBDevice(object):
@@ -133,9 +133,12 @@
             raise "Reply out of order, got 0x%02x expected 0x%02x" % (ord(rx[6]), self.tag)
 
         rxlen = ord(rx[0]) << 24 | ord(rx[1]) << 16 | ord(rx[2]) << 8 | ord(rx[3])
+        print "Msg ID 0x%02x" % (ord(rx[4]))
+        if False and ord(rx[4]) != MSG_CMDREP:
+            raise "Unexpected Msg ID 0x%02x" % (ord(rx[4]))
+        
         if ord(rx[5]) != 0:
             print "Mystery byte %d != 0" % (ord(rx[5]))
-            
         # Fetch the actual reply now we know the length
         reply = ''
         while len(reply) < rxlen:
@@ -146,7 +149,45 @@
             
         return(reply)
 
+    def queryrsb(self):
+        msg = '\x00\x00\x00\x00\xd1\x18\x00'
+        self.s2.send(msg)
+        
+        reply = ''
+        while len(reply) < 7:
+            rx = self.s2.recv(7)
+            if rx == '':
+                raise "EOF from device"
+            reply += rx
 
+        # '\x00\x00\x00\x00\x80\x04\x01' => STB = 4
+        if rx[4] != '\x80':
+            raise "Incorrect Msg ID in response to STB query"
+        
+        return ord(rx[5])
+
+    def waitsrq(self):
+        msg = '\x00\x00\x00\x00\xb1\x00\x00'
+        
+    def testsrq(self):
+        msg = '\x00\x00\x00\x00\x91\x00\x00'
+        self.s2.send(msg)
+        reply = ''
+        while len(reply) < 7:
+            rx = self.s2.recv(7)
+            if rx == '':
+                raise "EOF from device"
+            reply += rx
+            
+        # 00 00 00 00 80 14 08 - SRQ = 0
+        # 00 00 00 00 a0 64 07 - SRQ = 1
+        if rx == '\x00\x00\x00\x00\x80\x14\x08':
+            return False
+        elif rx == '\x00\x00\x00\x00\xa0\x64\x07':
+            return True
+        else:
+            raise "Unknown SRQ byte sequence - " + str(map(ord, rx))
+        
 def test(r):
     import numpy
     from matplotlib import pylab