TODO Merge this page into the API-description.
There 3 different type of printers:
USB(idVendor, idProduct, interface, in_ep, out_ep)¶
Based on pyusb and libusb-1.0
idVendoris the Vendor ID
idProductis the Product ID
interfaceis the USB device interface (default = 0)
in_epis the input end point (default = 0x82)
out_epis the output end point (default = 0x01)
Serial(“devfile”, baudrate, bytesize, timeout)¶
Based on pyserial, default values are based on the defaults set by DIP_SWITCH_1 on the documentation(hardware side).
devfileis an alphanumeric device file name under /dev filesystem (default = /ev/ttyS0)
baudrateis the Baud rate for serial transmission (default = 9600)
bytesizesets the serial buffer size (default = 8)
timeoutdefines Read/Write timeout (default = 1)
Based on socket
host is an alphanumeric host name, could be either DNS host name or IP address.
port to write to (default = 9100)
Troubleshooting: Problems with a network-attached printer can have numerous causes. Make sure that your device has a proper IP address. Often you can check the IP address by triggering the self-test of the device. As a next step try to send text manually to the device. You could use for example:
- echo “OKn” | nc IPADDRESS 9100 # the port number is often 9100
As a last resort try to reset the interface of the printer. This should be described in its manual.
file_name is the full path to the device file name