120 20110-003 PRELIMINARY
Gemini/PD Technical Manual
3
2.1.1 LED
Indicators
The Gemini/PD has two LED indicators:
LED’s
name
Indicates
Description
PWR
red
DC Power is applied
red
Unit transmit
RX/TX
green
Unit receive
flashing
red/green
Radio is unlocked
2.2 DTE Port Interface
For all three ports:
DE-9 F
pin #
Function
1
DCD – from Gemini/PD, normally
asserted
2
RXD – data from Gemini/PD
3
TXD – data to Gemini/PD
4
DTR – to Gemini/PD, handshaking
5
Ground
6
DSR – from Gemini/PD, tied to
VCC through current limiting resis-
tor
7
RTS - to Gemini/PD, handshaking
8
CTS – from Gemini/PD, hand-
shaking
9
AUX auxiliary input to Gemini/PD,
“panic line” input (port 3):
It may be activated by dry contact
pull-up to the port’s DSR output. It
may also tolerate user pull-up to
ex12 VDC (car battery), but
an isolated dry contact is preferred
due to the risk of noise related false
alarms caused by the vehicle’s
electrical system.
We recommend the use of a shielded 9-wire
cable with all pins connected. These ports
can be used for unit configuration, mainte-
nance & adjustment as well to connect user
applications.
2.2.1 RS-232 Interface Signal
Levels
In the descriptions of data signals, the fol-
lowing conventions are used:
Table 1 - RS-232 Signal Levels
Term
Alternates
Signal level
ON
asserted, spacing
+3 to +15 V
OFF
dropped, marking
-3 to -15 V
