Blink Marine PK-1400, User Manual

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PK-1400_J1939_UM_REV1.2
17. Heartbeat (75h)
This message enables or disables the transmission of Heartbeat message. This message is
designed to indicate to other devices on the bus that this unit continues to function.
Byte 0 04h Header bytes
Byte 1 1Bh
Byte 2 75h Heartbeat
Byte 3 XXh XX:
00h Disabled (default)
01h Enabled
Byte 4 YYh YY: Period in milliseconds ÷ 10
From 05h (50ms) to FEh (2.54 sec)
Byte 5,7 FFh Not used
Example:
Direction Identifier Format Message Data
To keypad 18EF2100h Ext 04 1B 75 01 32 FF FF
FF Set heartbeat enabled
with 500ms period.
Heartbeat generated message:
Byte 0 04h Header bytes
Byte 1 1Bh
Byte 2 F9h Heartbeat message
Byte 3 XXh XX: Message counter, incremented
each message sent
Byte 4 K8 K7 K6 K5 K4 K3 K2 K1 Button state indicators
Each bit represents a button state
0: OFF
1: ON
Byte 5 00 00 K14 K13 K12 K11 K10 K9
Byte 6,7 FFh Not used
Example:
Direction Identifier Format Message Data
From
keypad 18EFFF21h Ext 04 1B F9 03 02 00 FF
21 Heartbeat message with
button 2 pressed.
18. Periodic Key message period (77h)
This message sets the period time for the Key state messages (71h). This does not enable
or disable the messages.
Byte 0 04h Header bytes
Byte 1 1Bh
Byte 2 77h Periodic key message period
Byte 3 XXh XX: Period in milliseconds ÷ 10
From 05h (50ms) to FEh (2.54 sec)
Byte 4,7 FFh Not used
Example:
Direction Identifier Format Message Data
To
keypad 18EF2100h Ext 04 1B 77 0A FF FF FF FF Period set to 100ms