utilisation d'un relay controller BV4111

J'essaye de programmer un séquencer, autrement dit choisir d'émettre un courant électrique en fonction du temps dans 8 sorties au choix. (le matériel : BV4111 relay controller)
j'utilise un port usb.
Voici la documentation
http://doc.byvac.com/index.php5?title=Product_BV4111

j'ai donc mis les modules nécessaires qui sont en tout en bas de la page ci dessus.

Problème j'ai testé BV4111_demo.py simplement en éditant ce programme dans eclipse et en faisant run message : "Com port needed as part of input"

en fait je veux simplement actionner une sortie puis l'éteindre après un certain temps, c'est ce que faisait me semble-t-il le programme BV4111_demo_py ...

voici le code de BV4111_demo_py

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# Python 2.7 demonstration using the bv4109 class
 
from time import sleep
import sys
import BV4111
 
# ******************************************************************************
# D E M O for BV4111 - relay controller
# ******************************************************************************
def main():
    # input com port on start
    if len(sys.argv) < 2:
        print "Com port needed as part of input"
    else:
        # connect to serial port, this can be done in any maner but the 
        # connect in sv3cl is convenient
        sp = BV4111.sv3clV2_2.Connect(sys.argv[1],115200)
        # class instance for sv3 device, assume address 'a' and
        # default ack
        Devd = BV4111.bv4111(sp,'d')
        d = Devd.Discover()
        print "Discover() reports ",d
        if Devd.Active() !=0:
            print "Switching relay 1"
            for j in range(1,5):
                Devd.Rly(1,1,0)
                sleep(0.2) 
                Devd.Rly(1,0,0)
                sleep(0.2) 
            print "Switching relay 2"
            for j in range(1,5):
                Devd.Rly(2,1,0)
                sleep(0.2) 
                Devd.Rly(2,0,0)
                sleep(0.2) 
        else:
            print "Device address d not found"
            print "This may be because the device is not connected properly"
            print "If discover reports device d then increase the timeout"
            print "in the connect function in file sv3clV2_2.py"
        sp.close()    
 
if __name__ == "__main__":
    main()

Voici les deux autres codes des modules nécessaires : BV4111

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# Device BV4111
# Serial relay driver for up to 8 relays, relays are designated
# 'a' throug 'g'
#
#
import sv3clV2_2
 
class bv4111(sv3clV2_2.sv3):
    # ******************************************************************************
    # R E L A Y  S E C T I O N
    # ******************************************************************************
 
    # ------------------------------------------------------------------------------
    # For convenience the relay 'a' throug 'g' is translated to a number 1 to 8
    # example for use:
    # Rly(3,1,50) # turns on relay 'c' in 50mS
    # returns 0 on sucess
    # ------------------------------------------------------------------------------
    def Rly(self,rly,onn,when):
        #rly+96 convert 1 to 'a' etc.
        cmd = chr(rly+96)+str(onn)+","+str(when)+"\r"
        self.Send(cmd)
        return self.Wack()
 
    # ------------------------------------------------------------------------------
    # returns timer value (integer) for specified relay
    # this time relay is specifed 1 to 8
    # ------------------------------------------------------------------------------
    def Val(self,rly):
        self.Send("r"+str(rly)+"\r")
        return self.Read()
 
    # ------------------------------------------------------------------------------
    # all relays off
    # ------------------------------------------------------------------------------
    def Alloff():
        self.Send("o\r")
        return self.Wack()

pour finir

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# sv3clV2_2.py
#
# Verion 2.0  Implemented as a class separate from the serial connection
#   2.1 16/2/13: Changed how Wack works
#   2.2 23/7/13: Changes to the SV3 protocol
#       SV3 now default to 115200 Baud not autobaud 
#       Added 'H' command to discover devices.
#
# sv3 protocol for ByVac SV3 serial devices. This code can be imported for
# the required device. It contains the common commands and also has a small
# program for setting up the eeprom values.
#
# The serial communication in Python is by defualt text, text is sent and text
# is recieved so in the following code chr() and ord() is used to do the
# conversions
#
# To keep the code simple and easy to read, no range checking is done, you may
# want to add this later.
#
# Only connect 1 device when using the eeprom and some other commands.
#
import serial
from time import sleep
BAUD_RATES = { 2400:1, 4800:2, 9600:3, 14400:4, 19200:5, 38400:6, 115200:7 } 
 
# ------------------------------------------------------------------------------
# returns the comport connector for use with class. Can only open one instance
# of a serial connection so this has to be used accross classes when there
# is more than one device on the serial bus
# ------------------------------------------------------------------------------
def Connect(port,baud):
    return serial.Serial(port, baud, timeout=.05, stopbits=1, parity='N' )
 
 
# ------------------------------------------------------------------------------
# The class does not contain the serial connection but must be passed it. This
# enables more than one device on any serial bus
# ------------------------------------------------------------------------------
class   sv3:
    """SV3 Device Protocol ByVac Version 2.2"""
    sp = None   # sp is set to communication device by Init()
    adr = None # address is the address of the device this instance is addressing
    def __init__(self,com,address,ack='\006'):
        self.sp = com # communication instance
        self.adr = ord(address) # address of device for this instance
        self.ack = ack 
 
    # --------------------------------------------------------------------------
    # commands always start with address, this will send the address followed
    # by the string. NOTE it is up to the caller to supply the \r and Wack
    # --------------------------------------------------------------------------
    def Send(self,str):
        self.sp.flushInput()
        self.sp.write(chr(self.adr))
        self.sp.write(str)
 
    # --------------------------------------------------------------------------
    # nearly all commands ACK when finished
    # Will wait for ACK and return 0 if not received
    # --------------------------------------------------------------------------
    def Wack(self):
        k = None
        while k != '':
            k = self.sp.read(1)
            if k == '':
                return 0
            elif k == self.ack:
                return 1
 
    # --------------------------------------------------------------------------
    # reads characters up to ACK and returns them
    # note will return a string
    # --------------------------------------------------------------------------
    def Read(self):
        k = ''
        v = ''
        timeout = 100
        while k != self.ack:
            k = self.sp.read(1)
            if len(k) == 0: # timeout
                timeout-=1
                if timeout <= 0:
                    break
                else:
                    continue
            if k != self.ack:
                v = v + k
        return v
 
    # --------------------------------------------------------------------------
    # returns device ID as an integer
    # --------------------------------------------------------------------------
    def ID(self):
        self.Send('D')
        self.sp.write('\r')
        return self.Read()
 
    # --------------------------------------------------------------------------
    # returns firmware value as a string in the form "h.l"
    # --------------------------------------------------------------------------
    def Firmware(self):
        self.Send('V')
        self.sp.write('\r')
        return self.Read()
 
    # --------------------------------------------------------------------------
    # reset, will need initialising again
    # --------------------------------------------------------------------------
    def Reset(self):
        self.Send('c')
        self.sp.write('\r')
        sleep(0.5)
 
    # --------------------------------------------------------------------------
    # Returns 1 if the device is listening, can also be called a few times
    # Command H introduced 23 July 2013
    # --------------------------------------------------------------------------
    def Active(self):
        self.Send('H')
        self.sp.write('\r')
        return self.Wack()
 
    # ------------------------------------------------------------------------------
    # EEPROM utilities
    # ------------------------------------------------------------------------------
    # --------------------------------------------------------------------------
    # reads the eeprom from eeprom address to eprom address
    # --------------------------------------------------------------------------
    def ReadEE(self,bfrom,bto):
        self.Send('R')
        self.sp.write(str(bfrom)+',') # comma delimiter
        self.sp.write(str(bto))
        self.sp.write('\r')
        rv = self.Read()
        return rv.split(',')
 
    # --------------------------------------------------------------------------
    # write a single value to eeprom
    # location is the address of the eeprom that
    # will have the range 0 to 255 - no checking is done.
    # all integers
    # returns 1 on sucesws
    # --------------------------------------------------------------------------
    def WriteEE(self,location,value):
        cmd = "W"+str(location)+","+str(value)+"\r"
        print cmd
        self.Send(cmd)
        return self.Wack()
 
    # --------------------------------------------------------------------------
    # change device address
    # address is an integer
    # --------------------------------------------------------------------------
    def ChangeAddress(self,adr):
        return self.WriteEE(1,adr)
 
    # --------------------------------------------------------------------------
    # change ACK
    # ACK is an integer
    # --------------------------------------------------------------------------
    def ChangeAck(self,ack):
        self.WriteEE(2,ack)
        self.ack = ack
        sleep(0.5)
 
    # --------------------------------------------------------------------------
    # change Baud rate 2400 to 115200 or 0
    # returns 1 on sucess
    # --------------------------------------------------------------------------
    def ChangeBaud(self,baud):
        if baud == 0:
            self.WriteEE(4,0)
        else:
            try:
                br = BAUD_RATES[baud]
                self.WriteEE(4,br)
                self.Wack()
                return 1
            except:
                return 0
 
    # --------------------------------------------------------------------------
    # discover devices on bus
    # --------------------------------------------------------------------------
    def Discover(self):
        devices = []
        self.sp.flushInput()
        for j in range(97,120):
            self.sp.write(chr(j)+"H\r")
            if self.Wack() != 0:
                devices.append(chr(j))
                # get ID
                self.sp.flushInput()
                self.sp.write(chr(j)+"D\r") # device id
                tmp = self.Read()
                devices.append(tmp)
                # get firmware
                self.sp.flushInput()
                self.sp.write(chr(j)+"V\r") # firmware version
                tmp = self.Read()
                devices.append(tmp)
        return devices

Merci d'avoir pris soin de lire et merci de vos réponses.
Patrick