User`s manual

EAGLE - ANNEX A.4. ANCILLARY DATA CHANNEL 66
PORT CONFIGURATION
The external device that transmits and/or receives data through the data channel will be
connected to the audio codec using the RS232 ANCILLARY PORTS; a RS232 cable like this
will be used:
PC EAGLE
Tx Tx
Rx Rx
GND GND
CTS RTS
RTS CTS
 Consult ANCILLARY CHANNELS pinout in chapter 3.1 of this manual.
HARDWARE CONFIGURATION
There are two operating modes of the data channel.
a) Variable –software controlled- speed:
The serial data port of the external equipment must be configured at the maximum speed
(115200 bauds). Software will determine the effective speed of the data transmission. External
equipment should be configured in the following way:
- 115200 bits per second. (Note that this speed is fixed and independent of the bit rate
of the (A) channel and of the effective transmission bit rate of the data channel (B).)
- 8 data bits
- 1 stop bit
- No parity
- Flow control: Hardware
When a PC is used as a data terminal, the audio codec can be connected directly to a COM
serial port. If another type of device that has a configuration other than the one specified is
used, it will be necessary to place an RS232 BAUD RATE CONVERTER between the audio
codec and the device. This device can be easily found in the market.
b) Fixed speed:
Physical connection between the EAGLE and the external device will be done using a fixed
baud rate equal to the effective baud-rate of the transmission, that can be 1200, 2400, 4800 or
9600 bauds.
SOFTWARE CONFIGURATION
The software configuration of the Eagle’s data channel is performed by selecting:
- The effective bit rate.
- Enabling the data channel: tx or rx direction, or both.
To select the effective bit rate in the variable speed configuration, there are three possible
modes, accessible in the configuration menu: Minimum, Maximum and Custom. The latter is
programmed from the control software in real time, and is a value between the minimum value
and the maximum value defined for each case. For the fixed speed connections, the selection
between 1200/2400/4800 and 9600 can be done in the same menu.
Enabling or disabling the data channel is also available in the configuration menu of the audio
codecs.