FlexRadio Systems FLEX-6400 User Manual

FLEX-6400/FLEX-6600 Hardware Reference Manual
Page 24 of 45
Copyright 2018 FlexRadio Systems. All Rights Reserved.
7.6.5 Pin 5, Pin 6, Pin 7, Pin 8 and Pin 10: GROUND
These pins are all connected to chassis ground.
7.6.6 Pin 9: +5VDC
This pin is a +5VDC output for use by external equipment. This pin is capable of sourcing
up to 500mA of current. A thermally resetting fuse will protect the radio from damage.
I - This pin is protected by a thermally protected fuse. If an over-current occurs, the fuse
will open and remain open until the overload is removed.
7.6.7 Pin 11: Accessory TX
This pin is a buffered PTT output identical to the three RCA connectors TX1, TX2, and TX3.
Refer to the SmartSDR documentation for information on how to configure this output.
7.6.8 Pin 12: SDA I/O
This pin is the data signal for an I2C serial communication channel. It is to be used with
external equipment. Refer to the SmartSDR documentation for more information.
7.6.9 Pin 13: Accessory TX REQ
This pin is an additional transmitter interlock signal input. Refer to the SmartSDR
documentation for information on how to configure this input.
7.6.10 Pin 14: PTT in
This pin is a Push-To-Talk input. Ground Pin 14 to engage transmit.
7.6.11 Pin 15: SCL I/O
This pin is the clock signal for an I2C serial communication channel. It is to be used with
external equipment. Refer to the SmartSDR documentation for more information.
7.7 PTT INPUT
This RCA connector is provided for an external Push-To-Talk signal. Ground the center pin
of this RCA to engage PTT. (Note: 3.3VDC Max. Input.)
7.8 TX REQUEST INPUT (INTERLOCK)
This RCA connector is provided to receive an interlock signal from external amplifiers, or
other external equipment. When enabled it will prevent the FLEX-6400/FLEX-6600 from

FlexRadio Systems FLEX-6400 Specifications

General

Brand	FlexRadio Systems
Model	FLEX-6400
Category	Transceiver
Language	English