Added utility programs which update motor subsitutions files from

the values read rom the actual controller

utils/deltatau.py

@@ -0,0 +1,51 @@
+"""
+  This is some code for communicating with a Delta-Tau PMAC motor 
+  controller as used at SINQ from python. Python 3 is assumed and 
+  tested. We use the ethernet protocol of the Pmac. This code benefits 
+  from the SICS driver for Pmac which in turn benefits from the driver 
+  written by Pete Leicester at Diamond.
+
+
+  Usage: python36 deltatau.py  pmachost:port command
+         Then returns the response for command. 
+
+  Mark Koennecke, October 2019
+"""
+
+import struct
+import socket
+
+def packPmacCommand(command):
+    # 0x40 = VR_DOWNLOAD 
+    # 0xBF = VR_PMAC_GETRESPONSE
+    buf = struct.pack('BBHHH',0x40,0xBF,0,0,socket.htons(len(command)))
+    buf = buf + bytes(command,'utf-8')
+    return buf
+
+def readPmacReply(input):
+    msg = bytearray()
+    expectAck = True
+    while True:
+        b = input.recv(1)
+        bint = int.from_bytes(b,byteorder='little')
+        if bint == 2 or bint == 7: #STX or BELL
+            expectAck = False
+            continue
+        if expectAck and bint == 6: # ACK
+            return bytes(msg)
+        else:
+            if bint == 13 and not expectAck: # CR
+                return bytes(msg)
+            else:
+                msg.append(bint)
+
+if __name__ == "__main__":
+    from sys import argv
+    addr = argv[1].split(':')
+    s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
+    s.connect((addr[0],int(addr[1])))
+    buf = packPmacCommand(argv[2])
+    s.send(buf)
+    reply = readPmacReply(s)
+    print(reply.decode('utf-8') + '\n')
+