On 5 dec, 23:21, w...@mac.com wrote: > On Dec 5, 2012, at 3:38 PM, Jean Dubois <jeandubois...@gmail.com> wrote: > > [byte] > > > > >> I note that in your Octave example you are reading characters rather than > >> lines. It seems to me that you have two choices here, either do the > >> equivalent in python or dig through the Keithley documentation to find the > >> hex codes thatusbtmcis presumably translating your commands into. If you > >> can find those, and if you are interested, I can send you off-line the > >> handler I wrote a couple of years ago that used a dictionary to translate > >> English commands into hex, then assembled those with a checksum and sent > >> the string out to a Keyspan usb to serial converter. > > > If you could show me how to "do the equivalent in Python" I'd > > appreciate that very much > > > best regards, > > jean > > -- > >http://mail.python.org/mailman/listinfo/python-list > > OK - I've excerpted some of the relevant code (the original was much longer > and included a lot of error checking). Please understand that the comments > were for my own use, this was never intended to see the light of day (as it > were). Also, the structure grew from a situation where I only had to worry > about a single controller model - single relay model to one where I had to be > able to deal with two controllers and two relay models. This was all python > 2.7 of course. > > ........................cut on dotted line.......................... > """ > serial_port = /dev/tty.KeySerial1, 2, 3, etc. > X10_controller = 1132B or TI103 > Relay_model = UM506 or RBn04 > Relay_address = B2 > > """ > import serial, string > > def checksum256(st): > temp = reduce(lambda x,y:x+y, map(ord,st)) % 256 > if temp < 9: > hex_temp = '0'+str(temp) > return hex_temp > hex_temp = hex(temp).upper()[2:] > return hex_temp > > letr_address_dict = {'A':'\x46', 'B':'\x4E', 'C':'\x42', 'D':'\x4A', > 'E':'\x41', 'F':'\x49', 'G':'\x45', 'H':'\x4D', 'I':'\x47', 'J':'\x4F', > 'K':'\x43', 'L':'\x4B', 'M':'\x40', 'N':'\x48', 'O':'\x44', 'P':'\x4C' } > numb_address_dict = {'1':'\x4C', '2':'\x5C', '3':'\x44', '4':'\x54', > '5':'\x42', '6':'\x52', '7':'\x4A', '8':'\x5A', '9':'\x4E', '10':'\x5E', > '11':'\x46', '12':'\x56', '13':'\x40', '14':'\x50', '15':'\x48', '16':'\x58' } > cmd_dict = {'SoC':'\x63', 'All_Units_Off':'\x41', > 'All_Lights_On':'\x43', 'ON':'\x45', 'OFF':'\x47', 'Dim':'\x49', > 'Bright':'\x4B', 'All_Lights_Off':'\x4D', 'Rep_Cnt1':'\x41', > 'Rep_Cnt2':'\x42'} > > def relay(port, controller_model, relay_model, relay_address, command): > if controller_model == '1132B': > if relay_model == 'UM506' or relay_model == 'UM7206': > letr = letr_address_dict[relay_address[0]] > numb = numb_address_dict[relay_address[1]] > cmd = cmd_dict[command] > cmd_string = '\x63'+letr+numb+cmd+'\x42' # Start-of-Command + > address_letter + address_number + command + Rep-count > ser = serial.Serial(port, 9600, timeout=1) # Set up handle to > serial port > stat1 = ser.write('\x02') # Write attention to > PowerLink, stat = number of bytes written, not really an error return. > ack1 = ser.read(2) # Check to see if > PowerLink is ready > if ack1 == '\x06\r': # It returns ACK<CR> > (\x06\r) if it is > stat2 = ser.write(cmd_string) > ack2 = ser.read(19) > if command == 'ON' and ack2 == 'XN\\1\rXNE1\rXNE1\r' : status > = 0 > if command == 'OFF' and ack2 == 'XN\\1\rXNG1\rXNG1\r': status > = 0 > if command == 'ON' and ack2 != 'XN\\1\rXNE1\rXNE1\r' : status > = 1 > if command == 'OFF' and ack2 != 'XN\\1\rXNG1\rXNG1\r': status > = 1 > elif ack1 =='\x15': # PowerLink sends > NAC (hex 15) if it isn't. > print('Received NAK from X10 Control, is there too much X10 > traffic on the line?\n') > else: print("Something's wrong with X10 control. Ack returned > was: " + ack1 + "\n") > stat3 = ser.close() # Close serial port > return(status) > > --------- > some irrelevant stuff was here, snipped > --------- > elif controller_model == 'TI103': > if relay_model == 'UM506' or relay_model == 'UM7206': > letr = relay_address[0] > numb = relay_address[1] > if int(relay_address[1]) <= 9: numb = '0'+numb > > # stat1 = ser.write('$>28001B02B02 BONBONCC#') # Tell TI103 to send > "On" to device B2 > > ser = serial.Serial(port, 9600, timeout=0.1) # Set up handle to > serial port > > cmd_string = '$>28001'+letr+numb+letr+numb+' > '+letr+command+letr+command > ck_sum = checksum256(cmd_string) > cmd_string = cmd_string+ck_sum+'#' > > stat2 = ser.write(cmd_string) > ack2 = ser.read(10) > if ack2 != '$<2800!4B#': print('Problem writing command string, > controller ACK =', ack2) # $<2800!4B# == success > > stat3 = ser.close() # Close serial port > # > #------ Now, check status of UM506 to be sure it took the command -------- > # > ser = serial.Serial(port, 9600, timeout = 0.1) > for i in range(0,3): > cmd = 'SRQ' # Status request > command > cmd_string = '$>28001'+letr+numb+letr+numb+' > '+letr+cmd+letr+cmd > ck_sum = checksum256(cmd_string) > cmd_string = cmd_string+ck_sum+'#' > stat2 = ser.write(cmd_string) > ack2 = ser.read(10) > if ack2 != '$<2800!4B#': print('Problem writing command > string, controller ACK =', ack2, 'Trying ', i, 'times.') # $<2800!4B# == > success > if ack2 == '$<2800!4B#': break > > cmd_string = '$>2800008C#' # Relay response is > in the TI123's buffer, this command will read it back > stat2 = ser.write(cmd_string) > ack2 = ser.read(150) > stat3 = ser.close() > temp = ack2.strip().split(' ') > loc = str(temp).find(command) > if loc >= 0: stat3 = True > return(stat3) > > elif relay_model =='RF124': > letr = relay_address[0] > numb = relay_address[1] > if int(relay_address[1]) <= 9: numb = '0'+numb > > ser = serial.Serial(port, 9600, timeout=0.1) # Again, set up > serial port > > for i in range(0,3): > cmd_string = '$>28001'+letr+numb+letr+numb+' > '+letr+command+letr+command > ck_sum = checksum256(cmd_string) > cmd_string = cmd_string+ck_sum+'#' > stat2 = ser.write(cmd_string) > ack2 = ser.read(10) > if ack2 == '$<2800!4B#': break > if ack2 != '$<2800!4B#': print('Problem writing command > string, controller ACK =', ack2, 'Trying ', i, 'times.') # $<2800!4B# == > success > if ack2 != '$<2800!4B#': log_write(log_file, 'Problem writing > command string, controller ACK =', ack2, 'Trying ', i, 'times.') > > stat3 = ser.close() # Close serial port > # > # Now, check status of RF124 to be sure it took the command > # > ser = serial.Serial(port, 9600, timeout = 0.1) > for i in range(0,3): > cmd = 'SRQ' # Status request > command > cmd_string = '$>28001'+letr+numb+letr+numb+' > '+letr+cmd+letr+cmd > ck_sum = checksum256(cmd_string) > cmd_string = cmd_string+ck_sum+'#' > stat2 = ser.write(cmd_string) > ack2 = ser.read(10) > if ack2 == '$<2800!4B#': break > if ack2 != '$<2800!4B#': print('Problem writing command > string, controller ACK =', ack2, 'Trying ', i, 'times.') # $<2800!4B# == > success > if ack2 != '$<2800!4B#': log_write(log_file, 'Problem writing > command string, controller ACK =', ack2, 'Trying ', i, 'times.') > > cmd_string = '$>2800008C#' # Relay response is > in the TI123's buffer, this command will read it back > stat2 = ser.write(cmd_string) > ack2 = ser.read(150) > stat3 = ser.close() > temp = ack2.strip().split(' ') > loc = str(temp).find(command) > if loc >= 0: stat3 = True > if loc == -1: stat3 = ack2 > return(stat3)
It seems there is some misunderstanding here. What I meant with how to "do the equivalent in Python" refered to "reading characters rather than lines". I have written working code myself for another Keithleu which does use RS232 for communication. The problem now is specifically for the new Keithley which doesn't allow RS232 but only USB-communication over usbtmc. So if the "buffer-problem" could be changed by reading characters that would be great. regards, Jean -- http://mail.python.org/mailman/listinfo/python-list
