120 20110-100
Gemini/PD Installation Guide
10
Table 1 - Gemini
PD
LEDs indications
Gemini
PD
LEDs indications
Power-on Sequence (LEDs are paired)
Normal Operation (LEDs are independent)
PWR
RX / TX
Indication
PWR
Indication
RX / TX
Indication
Red
Red
Normal boot-up start
(10 to 27 sec.)
Green
Normal ready state
Off
No network activity
Amber
Off
Then 8 seconds to
completing boot-up
No
rm
al
Green
Off
Normal state
Amber
1 Pulse/sec.
Sufficient satellites
acquired by GPS
Green
Receiving packets
“DBA sync” allows
transmit
Red
Off
Hardware failure
Amber
Receiving packets
“DBA out-of-sync”
prevents transmit
E
rrors
Slow
Red/Green
Red
Software failure
(firmware erased)
Red
Transmitting
S
p
eci
al
Fast
Red/Green
Red
Programming in
progress
3.2 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 resistor
7
RTS - to Gemini
PD
, handshaking
8
CTS – from Gemini
PD
, handshaking
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 ca-
ble with all pins connected. These ports can be
used for unit configuration, maintenance & ad-
justment as well to connect user applications.
3.2.1 RS-232 Interface Signal Levels
In the descriptions of data signals, the following
conventions are used:
Table 2 - RS-232 Signal Levels
Term
Alternates
Signal level
ON
asserted, spacing
+3 to +15 V
OFF
dropped, marking
-3 to -15 V
