GALILEOSKY GLONASS/GPS Satellite v4.0 (0223) User’s manual
GalileoSky Ltd.
Page 23
8
Connecting external peripheral
8.1
CAN-interface
The Terminal allows extracting information from the CAN-bus.
The following protocols are supported:
– J1939 (FMS). According to this protocol, the Terminal is not a device transmitting to CAN-bus, the device
does not change vehicle operation, it also doesn’t send confirmations to vehicle units packets and there
is no electrical noise in the CAN-bus. In some cases, by connection to the troubleshooting socket for
correct reading of information from the bus it is necessary to send confirmations to vehicle units
packets, for this give ActiveCAN 1 command to the Terminal (section CAN settings).
– J1979 (OBD ΙΙ). This protocol works according to the question-answer mode, consequently the Terminal
transmits the data to the CAN-bus.
Available performance modes:
J1939_SCANER
– the bus scanner sending bus reports to the configurator.
FMS
– a standard FMS protocol filter. (see
www.bus-fms-standard.com
).
J1939_USER_29bit
– a configurable user filter. Identifier length is 29 bits.
J1939_USER_11bit
– a configurable user filter. Identifier length is 11 bits.
J19379_SCANER
–
the
bus scanner defining bus speed and identifier capacity.
J1979 _29bit
– a standard J1979 protocol filter for 29 bits identifiers.
J1979 _11bit
– a standard J1979 protocol filter for 11 bits identifiers.
8.1.1
J1939_SCANER mode
This mode is intended to study CAN bus reports, according to J1939 protocol.
Bit rates from 10000 bit/s up to 500000 bit/s (typical values: 62500, 12500, 250000, 500000) are
supported.
11 and 29 bit identifiers are supported.
The scanning mode works as follows:
1.
The «
CAN. Start
scan.»
message is displayed;
2.
The CAN-bus reports are displayed with a delay indicated by the CAN Regime command. (section
CAN settings).
29bit identifiers are displayed in the following format:
ID=00000009 (8) 06 07 08 09 00 CC DD EE
where
ID – is a 29bit message identifier;
(8) – is the number of received bus bytes.
06 07 08 09 00 CC DD EE – is an 8byte message. (The lower byte is on the left, the higher byte is
on the right),
11bit identifiers are displayed as:
ID=009 (8) 06 07 08 09 00 CC DD EE
where
ID – is an 11bit message identifier;
(8) – is the number of received bus bytes;
06 07 08 09 00 CC DD EE – is an 8byte message. (The lower byte is on the left, the higher byte is
on the right).
3.
After all the identifiers have been displayed you can see the
CAN. End scan.
message.
To enable this mode:
1)
Connect the Terminal to the vehicle CAN interface;
2)
In the Configurator on Settings/CAN tab select bus rate and delay time (time of message waiting
time);
3)
Press Start Scanning J1939. Received data are displayed in the right panel.
