繼電器常識：

繼電器有三個接線柱：常開(NO)，常閉(NC)，接地(C)

如果連接的時間長，偶爾需要斷電， 那么接NC 和 C， 這樣繼電器set on 時為斷電。除此之外，繼電器還可以控制按鍵，以及長按。

繼電器接通時，該繼電器的燈會亮。ZZR08有8個繼電器，以一個字節表示其整體狀態，以每位的位高（bit high）代表對應繼電器的狀態。例如：第一個繼電器set on 時為00000001，set off 時該位為0；第二個set on 時為00000010(2), set off 時該位為0。以此類推.

怎樣使用繼電器：

1. Command “ls /dev/tty*”, you can find like this
/dev/ttyRelayCard

在接入繼電器之前運行“ls /dev/tty*”， 接入之后再運行一次，多出來的就是繼電器的標識。

2.Check the file /etc/udev/rules.d/ACS.rules. In this file, there have a code like

this:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60",
SYMLINK+="ttyRelayCard", MODE="0666", OWNER="buildbot"

If there don’t have this code, please add it by manual. And then re-plugin the

relay card’s USB cable.

查看是否存在/etc/udev/rules.d/ACS.rules，如果不存在，則建立文件：touch ACS.rules，文件內容如上。

3. 查看權限：ls -l/dev/ttyRelayCard， 結果crw-rw---- 1 rootdialout.

可以更改繼電器權限：chmod a+rw/dev/ttyRelayCard. 這樣壞處是，每次插拔繼電器都要更改。

繼電器的user是root, group是dialout?？梢允巩斍坝脩魪膶儆赿ialout用戶組。查看user的用戶組：groups user。更改user的附屬用戶組list: sudo usermod -G dialout,adm,...

4. python script

import serial
import sys, time
'''
ser = serial.Serial(
port=None,              # number of device, numbering starts at
# zero. if everything fails, the user
# can specify a device string, note
# that this isn't portable anymore
# if no port is specified an unconfigured
# an closed serial port object is created
baudrate=9600,          # baud rate
bytesize=EIGHTBITS,     # number of databits
parity=PARITY_NONE,     # enable parity checking
stopbits=STOPBITS_ONE,  # number of stopbits
timeout=None,           # set a timeout value, None for waiting forever
xonxoff=0,              # enable software flow control
rtscts=0,               # enable RTS/CTS flow control
interCharTimeout=None   # Inter-character timeout, None to disable
)
'''

device = sys.argv[1] # /dev/ttyRelayCard
ser = serial.Serial(device, 19200, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_TWO, None)
W = 0.05

def get_version():
    cmd = 90
    print "get the relay software version"
    ser.write(chr(cmd))
    time.sleep(W)
    a = ser.read(1)
    print ord(a)
    b = ser.read(1)
    print ord(b)
    time.sleep(1)

def set_relay_on(i):
    ''' relay No is from 1 to 8'''
    cmd = 100 + i
    print "set relay %d on "%(i)
    ser.write(chr(cmd))
    time.sleep(W)
    ser.write(chr(91)) # get relay states
    a = ser.read(1)
    print ord(a)
    time.sleep(W)

def set_relay_off(i):
    ''' relay No is from 1 to 8'''
    cmd = 110 + i
    print "set relay %d off"%(i)
    ser.write(chr(cmd))
    time.sleep(W)
    ser.write(chr(91))
    a = ser.read(1)
    print ord(a)
    time.sleep(W)
    
set_relay_off(1)
# set_relay_on(1)

newer edition:

import serial
import sys, time
'''
base API of controlling Relay.
'''
class RelayControl(object):
    def __init__(self, relay_id='/dev/ttyACM0', interval=0.05):
        self.relay_id = relay_id
        self.interval = interval
        self.handler = serial.Serial(relay_id, 19200, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_TWO, None)

    def get_version(self, cmd=90):
        print "get the relay software version"
        self.handler.write(chr(cmd))
        time.sleep(self.interval)
        a = self.handler.read(1)
        print ord(a)
        b = self.handler.read(1)
        print ord(b)
        time.sleep(1)

    def get_relay_status(self, cmd=91):
        self.handler.write(chr(cmd))
        a = self.handler.read(1)
        print ord(a)
        time.sleep(self.interval)
        return ord(a)

    def set_relay_on(self, relay_no):
        ''' relay No is from 1 to 8'''
        cmd = 100 + relay_no
        print "set relay %d on "%(relay_no)
        self.handler.write(chr(cmd))
        time.sleep(self.interval)
        self.get_relay_status()

    def set_relay_off(self, relay_no):
        ''' relay No is from 1 to 8'''
        cmd = 110 + relay_no
        print "set relay %d off"%(relay_no)
        self.handler.write(chr(cmd))
        time.sleep(self.interval)
        self.get_relay_status()

    def set_all_relay_on(self, cmd=100):
        print "set all relays on "
        self.handler.write(chr(cmd))
        time.sleep(self.interval)
        self.get_relay_status()

    def set_all_relay_on(self, cmd=110):
        print "set all relays off "
        self.handler.write(chr(cmd))
        time.sleep(self.interval)
        self.get_relay_status()

附錄

ZZR08 command Table

Command			Action
Character	DEC	HEX
	90	5A	Get software version - returns 2 bytes, the first being the module ID which is 8, followed by the software version
	91	5B	Get relay states - sends a single byte back to the controller, bit high meaning the corresponding relay is powered
	92	5C	Set relay states - the next single byte will set all relays states, All on = 255 (11111111) ,All off = 0
d	100	64	All relays on
e	101	65	Turn relay 1 on
f	102	66	Turn relay 2 on
g	103	67	Turn relay 3 on
h	104	68	Turn relay 4 on
i	105	69	Turn relay 5 on
j	106	6A	Turn relay 6 on
k	107	6B	Turn relay 7 on
l	108	6C	Turn relay 8 on
n	110	6E	All relays off
o	111	6F	Turn relay 1 off
p	112	70	Turn relay 2 off
q	113	71	Turn relay 3 off
r	114	72	Turn relay 4 off
s	115	73	Turn relay 5 off
t	116	74	Turn relay 6 off
u	117	75	Turn relay 7 off
v	118	76	Turn relay 8 off

總結

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