3.2
Rear connec
Ɵ
ons
Table 19: I/O connector, pin out
I/O connector
Name
Pin
Func on
Dir
Level
Max
V
Max
mA
TxKey / GPIO
4
This I/O has four modes:
Mode 1:
Low Power (Gas alarm input). Force
TX into low power mode by grounding
this input.
Mode 2:
Open = Squelch closed (not receiving)
Closed = Squelch open (receiving /
Rxbusy)
Mode 3:
TxKey.
Key the transmi er by
grounding this input (PTT).
Mode 4:
Open = ALARM
Closed = NO ALARM
I/O
0 to +5 V /
Open collector.
Referenced to
GND (Pin 8)
28
50
BATT.COM
5
Communica on interface to BU-872
I/O
0 to +5 V
5
1
LINE
6
Line input, 600
Ω
unbalanced
I
-40 to +10 dBm
±
15
Rxbusy / GPIO
7
This I/O has four modes:
Mode 1:
Low Power (Gas alarm input). Force
TX into low power mode by grounding
this input.
Mode 2:
Open = Squelch closed (not receiving)
Closed = Squelch open (receiving /
Rxbusy)
Mode 3:
TxKey.
Key the transmi er by
grounding this input (PTT).
Mode 4:
Open = ALARM
Closed = NO ALARM
I/O
0 to +5 V /
Open collector.
Referenced to
GND (Pin 8)
28
50
GND
8
Common ground
-
Doc. No.: 103614 TR-910 Operator Rev. AB
jotron.com
25