#!/usr/bin/python # MODBUS # ADU : Application Data Unit # MBAP : MODBUS Application Protocol header # PDU : Protocol Data Unit # FC : Function Code # TID : Transaction Identifier (2 Bytes) # PID : Protocol Identifier, 0 for MODBUS, (2 Bytes) # len : Number of bytes following the len field, (2 Bytes) # UID : Unit Identifier (1 Byte) # # MODBUS TCP/IP ADU # ADU = [MBAP][PDU] # MBAP = [TID][PID][len][UID] # PDU = [FC][Data] import binascii from struct import * from collections import namedtuple from twisted.internet import reactor, protocol from twisted.protocols.basic import LineReceiver # Coil addresses per command CSTART = 0 CSTOP = 1 CIDLE = 2 CRESET = 3 # System Status Flags _OK = 1 << 0 _UP_TO_SPEED = 1 << 1 _RUN = 1 << 2 _ALARM = 1 << 3 _LEV = 1 << 4 _PHLOCK = 1 << 5 _MD = 1 << 6 _AVC_ON = 1 << 7 # Interlock Status Flags _DSP_WD_FAIL = 1 << 0 _OSC_FAIL = 1 << 1 _POS_ALARM = 1 << 2 _ESTOP = 1 << 3 _UPS_FAIL = 1 << 4 _EXT_FLT = 1 << 5 _CC_WD_FAIL = 1 << 6 _OVERSPEED = 1 << 7 _VAC_FAIL = 1 << 8 _OVERTEMP = 1 << 9 _REFLOSS = 1 << 10 _SPD_SENSOR_LOSS = 1 << 11 _COOLING_LOSS = 1 << 12 _DSP_SHUTDOWN = 1 << 13 _CC_SHUTDOWN_REQ = 1 << 14 _TEST_MODE = 1 << 15 # Mode values _RPM = 0 _PHASE = 1 # Direction _CW = 0 _CCW = 1 _POSDIR = _CCW # Some descriptive names for default register values per chopper. # The values are indexed by UID. RVAL = { 'mode': {1: _RPM, 2: _PHASE, 3: _PHASE}, 'dir' : {1: _POSDIR, 2: _POSDIR, 3: _POSDIR} } class Fermi_Prot(LineReceiver): def __init__(self): self.mbhlen = 7 self.fcbyte = 7 self.datstart=8 self.MBAP = namedtuple('MBAP','TID PID len UID') self.MBFN={1:self.rcoils,3:self.rhregs,5:self.wcoil,16:self.wmregs} self.setRawMode() self.RegVal = {} self.FermiCoil = {} for uid in [1,2,3]: self.FermiCoil[uid] = [0,0,0,0] mode = RVAL['mode'][uid] dir = RVAL['dir'][uid] sys_stat = _AVC_ON|_OK self.RegInfo = { 10: ['U16', 'System Status Information'], 12: ['U16', 'Interlock Status Information'], 14: ['U16', 'Rotational Speed'], 16: ['F32', 'Encoder Angle (MB350PC/R ONLY)'], 18: ['U32', 'Phase Veto Count'], 20: ['U32', 'Read and Clear Phase Veto Count'], 22: ['U32', 'Read and Clear Phase Veto Count' ], 24: ['F32', 'Read PHASE ACCURACY'], 26: ['F32', 'Read PHASE REPEATABILITY'], 28: ['F32', 'Read PHASE OK'], 30: ['U32', 'Set VETO WINDOW 100ns'], 32: ['U32', 'Set VETO WINDOW 50ns'], 34: ['U32', 'Set MOTOR CONTROL MODE'], 1000: ['U32', 'Set ROTATIONAL SPEED SETPOINT'], 1002: ['F32', 'Set HOMING ANGLE SETPOINT (MB350PC/R ONLY)'], 1004: ['F32', 'Set MOTOR KP'], 1006: ['F32', 'Set MOTOR KI'], 1008: ['F32', 'Set MOTOR KPhase'], 1010: ['F32', 'Set REFERENCE DELAY'], 1012: ['F32', 'Set REFERENCE PERIOD'], 1014: ['U32', 'Set SYNC SOURCE'], 1016: ['U32', 'Set MOTOR DIRECTION'] } self.RegVal[uid] = { 10: sys_stat, 12: 0, 14: 1000, 16: 0, 18: 0, 20: 0, 22: 0, 24: 0, 26: 0, 28: 0, 30: 0, 32: 0, 34: mode, 1000: 0, 1002: 0, 1004: 0, 1006: 0, 1008: 0, 1010: 0, 1012: 400000, 1014: 0, 1016: dir } def getFR(self, SA,QR): uid = self.mbap.UID type = self.RegInfo[SA][0] if (type == 'U32' or type == 'F32'): NE = QR/2 else: NE = QR EA = 2*NE + SA print 'NE = %d EA = %d ' % (NE,EA) data = [] for a in range(SA, EA, 2): print 'reg %d = %s' % (a, self.RegInfo[a][1]) data += [self.RegVal[uid][a]] return data def setFR(self, SA, QR, data): uid = self.mbap.UID type = self.RegInfo[SA][0] if (type == 'U32' or type == 'F32'): NE = QR/2 fs = '>%dI' else: NE = QR fs = '>%dH' EA = 2*NE + SA print 'NE = %d EA = %d ' % (NE,EA) t = unpack(fs % NE,data) print 'setFR(): t = ', map(hex, t) i = 0 for a in range(SA, EA, 2): n = t[i] print 'setFR() a = ', a, ' i = ', i, 'setFR() n = ', n print 'set reg %d = %s' % (a, self.RegInfo[a][1]), ' to ', hex(n) self.RegVal[uid][a] = n i += 1 return def rawDataReceived(self, ADU): # print "Received ADU " + binascii.hexlify(ADU) # print "Received ADU({}) {!r}".format(len(ADU),ADU) print "Received ADU ", ADU.encode('hex') self.ADU = ADU dl = len(ADU) self.mbap = self.MBAP._make(unpack('>3HB',ADU[:self.mbhlen])) self.fcode = unpack('>B', ADU[self.fcbyte])[0] print self.mbap, 'fcode = ', self.fcode self.MBFN[self.fcode]() # if (dl == self.mbhlen + self.mbap.len - 1): # print self.MBAP._make(unpack('> def connectionMade(self): print "Connection made" def getPDU(self): return self.ADU[self.datstart:] def rcoils(self): # FC = Function Code # SA = Start Address, QC = Quantity of Coils # BC = Byte Count, CS = Coil Status (each bit = status of one coil) # Request: FC<1B>, SA<2B>, QC<2B> # Response: FC<1B>, BC<1B>, CS # n = number of eights in QC plus 1 if there is a remainder. # ie n = QC // 8 + (1 if QC % 8 else 0) uid = self.mbap.UID PDU = self.getPDU() (SA, QC) = unpack('>2H',PDU) print 'rcoils:SA=%d, QC=%d' % (SA,QC) hdr = self.mbap._replace(len = 4) BC = 1 # ByteCount #TODO Coil values should be an array of bytes with each bit representing a coil if (self.FermiCoil[uid][SA] == 0xFF00): data = 1 else: data = 0 resp = pack('>3HB', *hdr) + pack('>2B%dB' % BC, self.fcode, BC, data) print 'resp = ', resp.encode('hex') self.sendLine(resp) def wcoil(self): uid = self.mbap.UID PDU = self.getPDU() (OA, OV) = unpack('>2H', self.ADU[self.datstart:]) print 'wcoil:OA=%d, OV=%X' % (OA,OV) self.FermiCoil[uid][OA] = OV if (OA == CSTART): # Set RotSpeed value self.RegVal[uid][14] = self.RegVal[uid][1000] if (self.RegVal[uid][34] == _PHASE): self.RegVal[uid][10] |= (_UP_TO_SPEED|_RUN|_LEV|_PHLOCK) else: self.RegVal[uid][10] |= (_UP_TO_SPEED|_RUN|_LEV) elif (OA == CSTOP): self.RegVal[uid][14] = 0 if (self.RegVal[uid][34] == _PHASE): self.RegVal[uid][10] &= ~(_UP_TO_SPEED|_RUN|_LEV|_PHLOCK) else: self.RegVal[uid][10] &= ~(_UP_TO_SPEED|_RUN|_LEV) elif (OA == CIDLE): print "Set IDLE" elif (OA == CRESET): print "RESET" print 'resp = ', self.ADU.encode('hex') self.sendLine(self.ADU) def rhregs(self): uid = self.mbap.UID PDU = self.getPDU() (SA, QR) = unpack('>2H', self.ADU[self.datstart:]) print 'rhregs:SA=%d, QR=%d' % (SA,QR) regval = self.getFR(SA,QR) print 'rhregs:data = ', regval hdr = self.mbap._replace(len = 3 + 2*QR) print 'hdr = ', hdr type = self.RegInfo[SA][0] if (type == 'U32' or type == 'F32'): NE = QR/2 resp = pack('>3HB', *hdr) + pack('>2B%dI' % NE, self.fcode, 2*QR, *regval) else: resp = pack('>3HB', *hdr) + pack('>2B%dH' % QR, self.fcode, 2*QR, *regval) print 'resp = ', resp.encode('hex') self.sendLine(resp) def wmregs(self): PDU = self.getPDU() (SA, QR, BC) = unpack('>2HB',PDU[:5]) data = PDU[5:] print 'wmregs:SA=%d, QR=%d, BC=%d' % (SA,QR,BC), 'data = ', map(hex, unpack('>%dH' % QR, data)) self.setFR(SA, QR, data) hdr = self.mbap._replace(len = 7) resp = pack('>3HB', *hdr) + pack('>B2H', self.fcode, SA, QR) print 'resp = ', resp.encode('hex') self.sendLine(resp) ### def main(): factory = protocol.ServerFactory() factory.protocol = Fermi_Prot reactor.listenTCP(61502,factory) reactor.run() if __name__ == '__main__': main()