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comparison scpisock.py @ 22:ef713fe03db8

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Add SCPI socket class.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 11 Aug 2011 21:18:09 +0930
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children c6be52360c2f
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21:6e7619f2dffd 22:ef713fe03db8
1 #!/usr/bin/env python
2
3 # Copyright (c) 2011
4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
5 #
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
8 # are met:
9 # 1. Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
11 # 2. Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in the
13 # documentation and/or other materials provided with the distribution.
14 #
15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 # SUCH DAMAGE.
26 #
27
28 import select
29 import socket
30
31 # See this for more info
32 # http://www.staff.uni-bayreuth.de/~btp918/cmt2007/geraete/agilent_34410A_dmm/manual/SCPI_Sockets.pdf
33 #
34 # ToDo: Implement the SRQ & DCL channel (I don't have any supported hardware)
35
36 SCPI_PORT = 5025
37
38 class SCPISockDevice(object):
39 def __init__(self, host, port = SCPI_PORT):
40 self.sock = socket.create_connection((host, port))
41
42 def flush(self):
43 while True:
44 r, w, x = select.select([self.sock], [], [], 0)
45 if len(r) == 0:
46 break
47 self.sock.recv(1024)
48
49 def write(self, data):
50 trail = ''
51 if data[-1] != '\n':
52 trail = '\n'
53
54 self.sock.send(data + trail)
55
56 def read(self, timeout = None):
57 res = ''
58 if timeout == None:
59 timeout = 0.1
60
61 while True:
62 r, w, x = select.select([self.sock], [], [], timeout)
63 if len(r) == 0:
64 break
65 res = res + self.sock.recv(1024)
66 if res[-1] == '\n':
67 break
68
69 return res.rstrip('\n')
70