User manual

120 20131-301 Gemini G3 - User Manual
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3.2 DTE Port Interface
For all three ports, we recommend the use of a shielded 9-wire cable with all pins connected. These
ports can be used for unit configuration, maintenance, & adjustment as well to connect user applica-
tions.
Table 3 - DTE port pin functions
DE-9 F pin # Function
1
DCD – from
GeminiG3, normally asserted
2 RXD – data from GeminiG3
3 TXD – data to GeminiG3
4 DTR – to GeminiG3, handshaking
5 Ground
6 DSR – from GeminiG3, tied to VCC through current limiting resistor
7 RTS - to GeminiG3, handshaking
8 CTS – from GeminiG3, handshaking
9 AUX - auxiliary input to GeminiG3
3.2.1 RS-232 Interface Signal Levels
In the descriptions of data signals, the following conventions are used:
Table 4 - RS-232 Signal Levels
Term
Alternates
Signal level
ON asserted, spacing +3 to +15 V
OFF
dropped, marking
-3 to -15 V