Fixme.ch:OldWiki/Kaba

RS-485 serial adapter

Specs

• Have USB to RS485 USB-485 Converter Adapter
• CH341D chipset, 75bps - 115200bps, 1200m(max)
• USB Product ID: 0x7523, Vendor ID: 0x1a86.

    New USB to RS485 USB-485 Converter Adapter Support Win7 XP Vista Linux Mac OS
    
    Item Description:
    100% Brand new and high quality.
    USB to RS485 Converter Adapter
    USB connector: to your PC
    RS485 connector: to your RS485 device
    No need external power, powered by USB port
    Fully compliant USB 2.0 standard , backward compatible with USB1.1
    
    Specification:
    Dimension:6.0 x1.8x1.4cm
    Color: Black
    Support System: Windows XP , Vista, Windows 7 , Linux , MacOS , and WinCE5.0 drive
    Supports baud rate range : 75bps - 115200bps , up to 6Mbps
    Supports Plug , Play and hot-swap ( USB side) ;
    Better than using CH341D chip or similar chip to support the laptop USB port .
    Communication distance up to 1.2KM, with anti-jamming performance of industrial site ;
    Work temperature range: -40°C ~ +85°C
    Communication distance :1200m(max)
    
    Applications:
    All kinds with RS485 port device parameter settings , data communication
    Short distance , such as parameter settings of the computer peripheral equipment , the use of common data lines can be .
    A and A port of the device when the wiring is connected , B and device B connected . Some devices D + A and D, - B .
    LED display of communication data
    Machine PLC data reading and writing
    Monitoring data read and write , and PTZ control
    Centralized control of household electrical appliances
    Access Control System ; card; A variety of industrial automation ; instrumentation; Parking ; bus fees; Dining Hall ; staff attendanceHighway toll station; ATM machine

Linux

You can use cu or minicom, possibly even screen. Line in use error: [1]

 apt-get install cu setserial
 gpasswd --add ${USER} dialout
 cu -l /dev/ttyUSB0

Hardware info

   root@ubuntu:~# dmesg | egrep --color 'serial|ttyS'
   [   13.850611] usbcore: registered new interface driver usbserial
   [   13.850635] usbcore: registered new interface driver usbserial_generic
   [   13.850654] usbserial: USB Serial support registered for generic
   [   13.854053] usbserial: USB Serial support registered for ch341-uart

 root@ubuntu:~# lsusb -v
 Bus 002 Device 002: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
 Couldn't open device, some information will be missing
 Device Descriptor:
 bLength                18
 bDescriptorType         1
 bcdUSB               1.10
 bDeviceClass          255 Vendor Specific Class
 bDeviceSubClass         0 
 bDeviceProtocol         0 
 bMaxPacketSize0         8
 idVendor           0x1a86 QinHeng Electronics
 idProduct          0x7523 HL-340 USB-Serial adapter
 bcdDevice            2.54
 iManufacturer           0 
 iProduct                2 
 iSerial                 0 
 bNumConfigurations      1
 Configuration Descriptor:
   bLength                 9
   bDescriptorType         2
   wTotalLength           39
   bNumInterfaces          1
   bConfigurationValue     1
   iConfiguration          0 
   bmAttributes         0x80
     (Bus Powered)
   MaxPower               96mA
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       0
     bNumEndpoints           3
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      1 
     bInterfaceProtocol      2 
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x82  EP 2 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0020  1x 32 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0020  1x 32 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0008  1x 8 bytes
       bInterval               1

Mac plug and play WCH341-Terminal

Linux