TDL2A Interface board - Short Technical Overview

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Configuring the TDi2

In order to use all the functions embedded in the on board TDL2A modem, the user must be aware of the

setup /programming facility, which allow different addresses and frequency channels to be set up, and if

necessary accesses diagnostic test modes.

The TDi2 is programmed through the same RS232 port that is used for sending/receiving data. An RS232

terminal emulator (such as Aterm or HyperTerminal) is an ideal tool.

Connect the TDi2 directly (or via serial straight through cable) to the PC serial port.

To enter program mode, insert the PGM jumper (to pull the SETUP pin of TDL2A low) and run the PC

HyperTerminal program. In this mode the radio link is disabled, but characters sent (at 9600 baud, as

normal) to the unit are echoed back on the RXD pin.

The HyperTerminal should be set with the following settings.

9600 baud RS232, 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. No flow control.

The unit will only respond to certain command strings:

ADDR0 to ADDR7 <CR><LF>

These commands set up one of 8 unique addresses. A TDi2 will

only communicate with a unit set to the same address.

CHAN0 to CHAN4 <CR><LF> These commands select one of 5 preset channels

A TDi2 will only communicate with a unit set to the same address and the same channel.

Address and channel numbers are stored in volatile memory. On power-up the TDi2 reverts to the default in

EEPROM (as supplied this is always address 0 and Channel 0)

SETPROGRAM <CR> Writes the current set address into EEPROM as the new default.

A tilda character (~, ascii 126dec) sent by the unit indicates end of

EEPROM write sequence

(these commands are normally only used for factory diagnostics)

NOTONE <CR>Transmit unmodulated carrier

LFTONE <CR> Transmit carrier modulated with 8KHz squarewave

HFTONE <CR> Transmit carrier modulated with 16KHz squarewave

# <CR>

Transmitter off

A Carriage Return '<CR>' (00Dhex) should be entered after each command sequence to execute it.

Releasing the SETUP (by removing the PGM jumper) to high state returns the TDi2 to normal operation