Proprietary Messages; Log Control Messages (Psalc) - JRC JLN-900 Installation And Instruction Manual

3.2 JLN-900 Proprietary Messages
JLN-900 has been allocated the proprietary mnemonic "SAL" by NMEA. This means that any
message starting with "$PSAL..." emanates from JRC equipment and that any letters
following can be chosen by us. However, to comply with standard NMEA messages, all these
messages uses a five-character combination $PSAL- before the first delimiter.
These proprietary messages are mainly used for internal programming, trouble-shooting, etc
and are only used in normal operation where no good alternatives are available.
These messages may be changed without notice.

3.2.1 Log control messages (PSALC)

3.2.1.1 Log control message 2: Bottom track transmit control
1 2 3 4
$PSALC,2,i*hh<CR><LF>
Field # Field Type
Name
1
i.
2
i.
3
hh
4
Example: Force acoustic transmitter off:
$PSALC,2,0*
3.2.1.2 Unit control message 3 (transmit status)
This message is intended for switching NMEA message transmission on or off. The primary
use is to switch off units when information is not needed by sending transmit status "Silent",
and to reactivate by sending "Active".
1 2 3 4
$PSALC,3,c*hh<CR><LF>
Field # Field Type
Name
1
i.
2
c
3
hh
4
Example: Turn off NMEA transmission:
$PSALC,3,S*
Definition
Proprietary SAL Control
Control message type
Bottom track transmission
Check sum
Definition
Serial control message
Control message type
Transmission status
Checksum
11-15
Note
PSALC
2: SAL T2 BT control
0: Set transmit mode off
1: Set transmit mode on
Note
PSALC
3: Transmit status
'A'=Active, 'S'=Silent