Usb relay - Revision history

Christopherh: /* Linux */

2024-04-11T12:04:37Z

Linux

← Older revision		Revision as of 12:04, 11 April 2024
Line 48:		Line 48:
	To switch off:		To switch off:
	'''echo -en '\xA0\x01\x00\xA1' > /dev/ttyUSB3'''		'''echo -en '\xA0\x01\x00\xA1' > /dev/ttyUSB3'''




	This script below is probably overkill, but will switch the device on and off as many times as you tell it to.		This script below is probably overkill, but will switch the device on and off as many times as you tell it to.


	It starts by asking you to unplug and reattach the box so that it can get the device ID of the USB dongle.		It starts by asking you to unplug and reattach the box so that it can get the device ID of the USB dongle.
	It saves this ID to a file, and then reads the file to a variable (Probably can be done better?)		It saves this ID to a file, and then reads the file to a variable (Probably can be done better?)


	The script then uses this as the device to switch the relay on and off.		The script then uses this as the device to switch the relay on and off.

Christopherh: /* Linux */

2024-04-11T12:04:15Z

Linux

@@ Line 38: / Line 38: @@
 This will tell you the ttyUSB number of the last thing that was connected to the PC.
 To control the relay enter the following commands in terminal (changing the ttyUSB number to the one reported):
@@ Line 47: / Line 49: @@
 '''echo -en '\xA0\x01\x00\xA1' > /dev/ttyUSB3'''
 === The box itself ===

Christopherh at 10:32, 11 April 2024

2024-04-11T10:32:43Z

← Older revision		Revision as of 10:32, 11 April 2024
Line 46:		Line 46:
	To switch off:		To switch off:
	'''echo -en '\xA0\x01\x00\xA1' > /dev/ttyUSB3'''		'''echo -en '\xA0\x01\x00\xA1' > /dev/ttyUSB3'''


			=== The box itself ===

			[[File:Relay box.png\|240px]]

			On the box there is a USB-B connection on the rear. Connect this to your PC.


			The two black terminals are connected together. Nothing is switched.


			The two red terminals are switched via the relay ONLY when the master control switch in on.
			If the switch is as per the photo, the relay is bypassed.


			The relay is set to be off by default.

Christopherh at 10:07, 11 April 2024

2024-04-11T10:07:09Z

@@ Line 1: / Line 1: @@
 The USB relay box contains one of these:
-[[File:https://wiki.sundance.com/images/thumb/3/39/USB_relay_image.jpg/284px-USB_relay_image.jpg]]
+[[File:USB relay image.jpg|240px]]
 It is a simple device that converts USB to a serial UART / Comport.
-When special commands are sent to the comport it either energises or de-engeriges the relay, switching between NC (Normally Connected)  and NO (Normally Open.
+When special commands are sent to the comport it either energises or de-engeriges the relay, switching between NC (Normally Connected)  and NO (Normally Open).
-So if a wire is routed through NO -> Com, when the relay is switched on the contacts close and the circuit completes.  When switched off again it opens and breaks the circuit.
 NC is the other way round.
-In windows you need to
+=== Windows ===

Christopherh: Created page with "The USB relay box contains one of these: File:https://wiki.sundance.com/images/thumb/3/39/USB_relay_image.jpg/284px-USB_relay_image.jpg It is a simple device that conver..."

2024-04-11T09:10:29Z

Created page with "The USB relay box contains one of these: File:https://wiki.sundance.com/images/thumb/3/39/USB_relay_image.jpg/284px-USB_relay_image.jpg It is a simple device that conver..."

New page

The USB relay box contains one of these:

[[File:https://wiki.sundance.com/images/thumb/3/39/USB_relay_image.jpg/284px-USB_relay_image.jpg]]

It is a simple device that converts USB to a serial UART / Comport.

When special commands are sent to the comport it either energises or de-engeriges the relay, switching between NC (Normally Connected) and NO (Normally Open.
So if a wire is routed through NO -> Com, when the relay is switched on the contacts close and the circuit completes. When switched off again it opens and breaks the circuit.

NC is the other way round.

In windows you need to