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UBI EasyCoder 401 – Technical Manual
• Flowcontrol, cont'd:
DTR
DTR (“Data Terminal Ready”) is a signal, which is not controlled in the setup mode,
but by straps on the CPU board or interface board. DTR high indicates that the
transmitting unit is turned on.
ENQ/ACK
In this protocol, the communication is controlled by the special characters ENQ
(ASCII 05 dec.) and ACK (ASCII 06 dec.) being transmitted on the same line as the
data. The sending unit transmits ENQ at regular intervals. If the response ACK is not
received the transmission is held up awaiting an ACK character from the receiving
unit. By default, this option is disabled.
XON/XOFF
In this protocol, the communication is controlled by the special characters XON
(ASCII 17 dec.) and XOFF (ASCII 19 dec.) being transmitted on the same line as the
data. XON/XOFF can be enabled/disabled separately for data received from the
host by the printer (printer sends XON/XOFF), and for data transmitted to the host
from the printer (host sends XON/XOFF).
XOFF is sent from the printer when its receive buffer is filled by 75%, and the
transmission from the host is held up awaiting an XON character. When enough
data have been processed that the receive buffer is filled only to 50%, the printer
sends an XON character and the host resumes transmitting data. The same
principles apply to XON/XOFF sent by the host, even if the percentage may differ.
By default, XON/XOFF is enabled for data both ways.
• New Line:
This setup parameter allows you select the character(s) transmitted
from the printer to specify the switching to a new line. There are
three options:
CR/LF
ASCII 13 dec. + ASCII 10 dec.
LF
ASCII 10 dec.
CR
ASCII 13 dec.
SETUP PARAMETERS, cont'd.
Serial Communication,
cont'd.
