Relay Relay:zzr08

Relay Knowledge:

Relays have three terminals: normally open (NO), normally closed (NC), Grounded (C)

If the connection takes a long time and occasionally requires a power outage, then NC and C are connected so that the relay set on is powered off. In addition, the relays can also control the keys, as well as the long press.

The relay lights up when the relay is switched on. The ZZR08 has 8 relays that represent their overall state in a single byte, with a bit height per bit (bit high) representing the status of the corresponding relay. For example: the first relay set on is 00000001,set off when the bit is 0, the second set on is 00000010 (2), and set off when the bit is 0. And so on.

How to use relays:

1. Command "ls/dev/tty*", you can find like this
/dev/tty Relaycard

Before the access relay run "ls/dev/tty*", after the access to run again, the more out is the identity of the relay.

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

This

subsystems=="usb", attrs{idvendor}=="10c4", attrs{ idproduct}=="ea60", SYMLINK+ ="ttyrelaycard" , mode="0666", owner="buildbot "

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

Relay card ' s USB cable.

Check to see if there is a/etc/udev/rules.d/acs.rules, and if it does not exist, create the file: Touch acs.rules, the file contents as above.

3. View permissions: Ls-l/dev/ttyrelaycard, result crw-rw----1 root dialout.

You can change the relay permissions: chmod a+rw/dev/ttyrelaycard. The downside is that each plug-in relay has to be changed.

The user of the relay is root and group is dialout. You can make the current user subordinate to the Dialout user group. To view user groups: Groups users. Change the user's secondary user group List:sudo usermod-g dialout,adm,...

4. Python Script

Import Serialimport 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 a unconfigured# an closed serial port obj ECT is createdbaudrate=9600, # baud ratebytesize=eightbits, # Number of Databitsparity=parity_none, # ENA ble parity Checkingstopbits=stopbits_one, # Number of Stopbitstimeout=none, # Set a timeout value, None for Wai Ting Foreverxonxoff=0, # Enable software flow controlrtscts=0, # Enable rts/cts flow Controlint Erchartimeout=none # inter-character Timeout, None to disable) ' device = sys.argv[1] #/dev/ttyrelaycardser = serial. Serial (device, 19200, Serial. Eightbits, serial. Parity_none, serial.     Stopbits_two, None) W = 0.05def get_version (): cmd = 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 = + i print "Set relay%d on"% (i) ser.write (Chr (cmd)) time.sleep (W) Ser.write (CHR) # get RelA  Y states A = Ser.read (1) Print ord (a) Time.sleep (W) def set_relay_off (i): ' Relay No ' from 1 to 8 ' cmd = + I print "Set relay%d off"% (i) ser.write (Chr (cmd)) time.sleep (W) ser.write (chr) A = Ser.read (1 ) Print Ord (a) time.sleep (W) Set_relay_off (1) # set_relay_on (1)

Appendix

ZZR08 Command Table

Command			Action
Character	DEC	HEX
	90	5 A	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 would set all relays states = 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

Relay Relay:zzr08