jotron TR-910 - Page 25

3.2 Rear connecƟons
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 0to+5V/
Open collector.
Referenced to
GND (Pin 8)
28 50
BATT.COM 5 Communicaon interface to BU-872 I/O 0to+5V 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 0to+5V/
Open collector.
Referenced to
GND (Pin 8)
28 50
GND 8 Common ground -
Doc. No.: 103614 TR-910 Operator Rev. AB jotron.com 25