CBM-202PC User’s Manual
23
CITIZEN
Signal Names and Functions
SIGNAL NAME
PIN NO.
I/O
FUNCTION
TXD
13
Output
Transmits status.
When data receiving is not available while in
XON/XOFF, XOFF (13H) is transmitted.
When receiving is made possible, XON (11H) is
transmitted.
RXD
15
Input
Receiving data signal.
On occurrence of a framing error or parity error, the
data are printed in "?".
DSR
100
Input
With this signal held in "LOW" when data are
transmitted from CPU while DTR/DSR has been
selected, transmitting takes place. With this signal
held in "HIGH", transmitting is does not take place
until it gets "LOW".
DTR
12
Output
Transmits data while this signal is held in "LOW".
If writing takes place while in "HIGH", overrun error
is created, where data are ignored.
Summary of Contents for CBM-202PC Series
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