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nanoTX
TM
Telemetry Transmitter
36
Quasonix, Inc.
Table 18: TTL Baseband Connector Pinout
Pin
Function
Notes
1
Serial Control Ground
Ground to controller
2
Serial Control Reply (Transmitter TXD)
Replies from TX to controller
3
Serial Control Input (Transmitter RXD)
Commands from controller to TX
4
No Connection
5
No Connection
6
TTL Data
TTL data input
7
TTL Clock
Synchronous with data, data valid on falling
edge
8
TTL Data/Clock Ground
9
RF On / Off
10
Power Ground
11
Power Ground
12
Power Ground
13
Power +28 VDC +/- 4 VDC
Refer to Table 20: DC Input Current at Standard
Input Voltage
14
Power +28 VDC +/- 4 VDC
15
Power +28 VDC +/- 4 VDC
3.3.1.1
Pin Information
Pin 1 is the ground connection to the serial control device. This pin is connected internally to pin 8, and pins 10, 11,
and 12, making the transmitter the central ground connection for the control device, the data/clock source, and
power.
Pin 2 carries the responses from the transmitter to the serial control device. This information is ASCII text, at RS-
232 levels, at 57,600 baud, 8 bits, no parity, 1 stop bit, no handshaking.
Pin 3 carries the commands from the serial control device to the transmitter. This information is ASCII text, at RS-
232 levels, at 57,600 baud, 8 bits, no parity, 1 stop bit, no handshaking.
Pins 4, 5, and 9 are available to support optional features.
Pin 6 is TTL input data. Input impedance is 10k ohms to ground (optionally 75 ohms). The transmitter reads the data
pin on the clock falling edge.
Pin 7 is TTL input clock. Input impedance is 10k ohms to ground (optionally 75 ohms). The transmitter reads the
data pin on the clock falling edge.
Pin 8 is the ground connection to the clock and data source. This pin is connected internally to pin 1, and pins 10,
11, and 12, making the transmitter the central ground connection for the control device, the data/clock source, and
power.