Note:
Blinking refers to the LEDs turning ON and OFF based on time (such as number of times per second)
.
Flashing refers
to the LEDs turning ON and OFF in response to an event occurring (such as packets)
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 applications.
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
21
