120 20120-211
Gemini
PD+
Installation Guide
12
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
Normal
Green
Off
Normal state
Amber*
1 Pulse per sec (1 pps)
Sufficient satellites
acquired by GPS
Green
Receiving packets
“DBA sync” allows transmit
Red
Off
Hardware failure
flashing
Red
-
Missing DSP
RSSI calibration
Amber
Receiving packets
“DBA out-of-sync” prevents
transmit
Errors
Slow
Red/Green
Red
Software failure
(firmware erased)
Red
Transmitting
Special
Fast
Red/Green
Red
Programming in
progress
* For 800 & 900 MHz US models (using Transmit duty cycle limit firmware) :
- PWR lit Green = normal indication or Flashing Amber = 1pps
- PWR lit Amber = exceeded duty-cycle or Flashing Green = exceeded d-c + 1pps
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 2 - DTE port pin functions
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+
, (for port 2:
“Officer requires assistance”
Alarm input)
It may be activated by (normally open) 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.
A +3 to +12 V signal at this pin will send a DMP
“x”
(On) message to the base.
An open or ground signal will send a DMP
“y”
(Off) message.
Messages are only sent when a signal transition occurs.
See Appendix “A” on page 24 for further details.
3.2.1 RS-232 Interface Signal Levels
In the descriptions of data signals, the following conventions are used:
Table 3 - RS-232 Signal Levels
Term
Alternates
Signal level
ON
asserted, spacing
+3 to +15 V
OFF
dropped, marking
-3 to -15 V