
Gemini Users Manual 124
8.5 Serial Communications
A graphical representation of the Gemini Serial socket is pictured left (i.e. Pin D is
closest to the top of the Gemini main Panel)
Either a DB9 or DB25 connector can be used for serial communications to a PC.
9-
Pin
25-
pin
Name
In/Out
Connected to
1 8 DCD In NC (or bridged to RTS)*
2 3 RD In Gemini A
3 2 TD Out Gemini B
4 20 DTR Out bridged to DSR*
5 7 GND - Gemini C
6 6 DSR In bridged to DTR*
7 4 RTS Out
bridged to CTS (and
DCD)*
8 5 CTS In bridged to RTS*
9 22 RI In NC*
NC= Not connected
* = Optional connection, e.g. serial pins 2,3 & 5 are often all that are required to be
connected on a 9 pin port.
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