Philips SOPHO SuperVisor 25 Engineer's Manual page 56

SV35 by means of a standard one-to-one cable.
Note: The signalling signals are not used. Only Receive Data and Transmit Data are used ('data
leads only' mode).
In case the interface is used for the Braille unit, only CT108 is used as signalling.
No other signalling is applied.
The communication protocol and the communication mode for the applications is denoted in
Table 6-2 "Communication Mode and
APPLICATION REQUIRED
Braille
Firmware
Download
Data Retrieval/
Data Storage
Dialling
Table 6-2 Communication Mode and Protocols.
The V.25 protocol is supported using the V.24 settings as denoted in the table above.
To select the protocol and to change the speed settings execute the following steps:
1. Go to 'Softkey Menu' by pressing the softkey.
2. Select communication menu by pressing the key which is below the 'comm' notation in the
display.
3. Select which type of communication you need.
- P-dial : required for downloading of firmware or directories.
- Braille : required for the Braille unit.
4. Select the bit rate.
- Braille unit = 19200 bit/s.
- Firmware downloading = 19200 bit/s.
- Directory applications = whatever is required but 9600 bit/s.
54
Protocols.".
BITS/
BITRATE PARITY
19200 bit/s 8 / No
19200 bit/s 8 / No
Selectable 8/No
but 9600bit/s
Selectable 8 / No
but 9600bit/s
XON/ ECHOING
XOFF CHAR.
No No
No No
Yes On -
received
data
Yes On -
received
data
COMMUNICATION
PROTOCOL
Dedicated for braille
unit
Propriety set of V.25 bis
commands
Proprietary set of V.25
bis commands
V.25 bis