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Example message for saving all data belonging to the Network Save Group (e.g. Node
Address).
CAN-ID
DLC Data
Byte 0
Data
Byte 1
Data
Byte 2
Data
Byte 3
Data
Byte 4
Data
Byte 5
Data
Byte 6
Data
Byte 7
0x18EF8000 8
0x04
0x05
0x00
0xA4
0x00
0x00
0x00
0x00
Some changes (e.g. Node Address) take effect after voltage reset of the keypad.
Custom Layer Settings
The Baudrate and the Node Address can be changed by the user. The default values are as
follows:
Object
Default value
baud rate (0x09)
0x03 (250 kbps)
Node-ID (0x1B)
0x80 (128)
The objects with their respective description including the corresponding safe/clear group can
be found in the K-Matrix. To change the values the user has to send a write data object request
(see 9.4.3) to the keypad with the corresponding object. After the keypad accepted the change
and responded with a write data object reply OK message the values have to be stored in non-
volatile memory (see 9.7). After the values are stored correctly a power reset has to be
performed. After that the keypad will be set to the new settings and communication will be able
only by using the changed values.
9.8.1
Manually configure the Baudrate
As an example the following table shows the J1939 messages that are necessary for changing
the Baudrate from 250 kbps (default value) to 500 kbps.
CAN-ID
DLC Data
Byte 0
Data
Byte 1
Data
Byte 2
Data
Byte 3
Data
Byte 4
Data
Byte 5
Data
Byte 6
Data
Byte 7
0x18EFFF00 8
0x04
0x09
0x00
0x02
0x00
0x00
0x00
0xFF
0x18EF0080 8
0x06
0x09
0x00
0x02
0x00
0x00
0x00
0xFF
0x18EFFF00 8
0x04
0x05
0x00
0xA4
0x00
0x00
0x00
0x00
0x18EF0080 8
0x06
0x05
0x00
0xA4
0x00
0x00
0x00
0xFF
First step for changing the baud rate is to send the new baud rate to the keypad with a Prop A
message defined in J1939-21. Data byte 3 represents the new baud rate (0x02 = 500kbps;
0x03 = 250kbps), data byte 1 the index of the baud rate and data byte 0 the command (Write
data object request). After the keypad receives a valid baud rate setting, the keypad send a
“write data object reply OK”- message (data byte 0 = 0x06).
Second step is to save the new baud rate to the non-volatile memory. The index of the store-
NVM-object is 0x05 (data byte 1). The data byte 3 contains the save group. Referenced to the
J1939 K-Matrix of the keypad the baud rate uses the save group “Network” (0xA4). After the
write request the keypad sends a “write data object reply OK”- message.