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Dual port operation mode
Both the RS-232C Ports A and B are effective in this mode.
Either of these ports selected by the PORTA/PORT B selector
switch (Port A when DSW2-2 is ON, Port B when DSW-2-2 is
OFF) or main Port selection command is called main port,
and the other is subport.
XY coordinate data is transmitted from the both ports if the
subport is enabled by turning OFF the DSW2-l, and is output
only from the main port if the subpart is disabled.
Commands
are input to the HDG-1111 only from the main port.
Data transfer between PORT A-PORT B is a unique feature of
the dual port operation mode.
All data input to the subport
will be transferred to the main port before being transmit-
ted.
Among the data sent to the main port, those other than
command data are transferred to the subpart before being
transmitted.
The command data are 02 HEX for stop-data-
output, 04 HEX for resume-data-output, and 01 HEX followed
by two ASCII characters.
The data transfer between the input and output will results
in a delay of approximately 0.1 ms.
RS-232C character composition
Start bit
Data bits
Parity bit
Stop bit(s)
1 or 2 bits (switch selectable)
Even or odd parity (switch selectable)
7 or 8 bits (switch selectable)
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