TXL2 ETC2 [List of Unclassifed Manufacturers], TXL2 Datasheet - Page 9

• Manufacturer Part Number: TXL2
• Description: UHF Multi Channel Transparent Data Link TX/RX
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

(these commands are normally only used for factory diagnostics)
NOTONE <CR>:
LFTONE <CR>:
HFTONE <CR>:
# <CR>:
A Carriage Return ‘<CR>’ (00Dhex) should be entered after each command sequence to execute it.
Releasing the TEST and PGM pins to high state return the modules to normal operation.
Application circuits
Interfacing a microcontroller to TXL2/RXL2
TXL2 and RXL2 can be directly interfaced to any microcontrollers. If the microcontroller has a built-in
UART, it can concentrate on its main task and leave the packet formatting, bit balancing and error
checking of serial data to TXL2/RXL2.
Serial data should be in the following format:
BUSY pin (in RXL2) can be connected to one of the port pins which can generate an interrupt on low-to-
high transition (e.g. RB0/INT pin in the PIC). This can be used to enter a receive sub-routine to
download data received from remote TXL2. Therefore, the host does not need to wait in a loop for a
packet.
Interfacing RS232 port to TXL2/RXL2
Some DTE hosts assert DTR signal when they are active and this can be used via RS232 line receiver to
enable TXL2. Otherwise the ENABLE must be physically pulled-low to activate the TXL2.
Radiometrix Ltd
1 start bit, 8 data bits, no parity, 1 or 2 stop bits
9600bps
0V=low, 5V=high
Figure 9: TXL2/RXL2 interfaced to an RS232 port via an RS232 line driver/receiver
Figure 8: TXL2 and RXL2 interfaced directly to a microcontroller
Transmit unmodulated carrier
Transmit carrier modulated with 8KHz squarewave
Transmit carrier modulated with 16KHz squarewave
Transmitter off
TXL2/RXL2 Data Sheet
page 9