Xon or Xoff Characters

NTI SERIMUX SERIES CONSOLE SWITCH

Note: If a modem is attached to the port, and hardware and/or software flow control is used, the appropriate command may be added to the modem initialization string:

Flow control	Command 1	Command 2
None	–	–
RTS/CTS (hardware)	&K3	\Q3
Xon/Xoff (software)	&K4	\Q1
Both	&K6
disable flow control (not necessary)	&K0	\Q0

Consult your modem user manual or the modem AT command manual to find the suitable command.

Any non-printable character (ASCII codes between 0 and 31) can be used as flow control Xon or Xoff character. The software flow control is transparent, so the special character is not passed to the connected device. If the Xon and Xoff characters are equal, a toggle mode is automatically used in the software flow control: whenever the special flow control character is received, the current state of flow control is toggled.

To change the Xon or Xoff character;

–press [6],

–then [0] for Xoff or [1] for Xon,

–enter the new value,

–then press [Enter] to save it, [Esc] or [Space] to cancel.

FYI: Press [T] after [6] to display a control codes table.

DTR line behavior

If a modem is not attached to the serial port, the DTR port line behavior on port disconnection can be selected as follows: the DTR line can be held high (active), low (inactive) or pulsed for 0.5 seconds and then held high. When a modem is attached to the port, the DTR line will be pulsed on port disconnection, disregarding this parameter value.

To modify the DTR line behavior on port disconnection;

–press [8],

–then [H] or [L] or [P] respectively.

Inter-character delay

An inter-character delay (1 - 60 ms) may be defined, each time a character sequence is transmitted from the port. Using this command, a minimum pause will appear between transmitted characters; for example, certain types of electro-mechanical devices (like teletype equipment) cannot process received characters continuously at their specified baud rate.

To select an inter-character delay;

–press [8],

–enter the new value (0 for no delay),

–and press [Enter] to save it, [Esc] or [Space] to cancel.

FYI: This parameter is not available for port 0.

Line-break receive or transmit

It is possible to accept the line-break received from a port, and to send it from the connected port. The break condition (when received) is defined as zero data with zero parity and no stop bits.

To allow or not the line-break receive;

–press [9],

–then [Y] for allowed,

–[Esc] or [Space] to cancel, any other character to deny.

To define the transmitted line-break extra-duration (this is added to the 1-character transmission time);

–press [0],

–then enter the new value (1 - 999 ms) or 0 to disable it,

–and press [Enter] to save it, [Esc] or [Space] to cancel.

FYI: These parameters are not available for port 0.

Flow control

Command 1