FMB641Manual CAN Commands

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To use Manual CAN commands functionality user should select Manual CAN Commands tab in Configurator. Afterwards, user will be able to configure CAN parameters in Manual CAN commands settings tab.

Manual CAN Commands

The main benefit of using Manual CAN command functionality is that the user is able to send data via CAN BUS without requiring additional CAN protocol development from the device's firmware side if vehicle should take an action with equipment connected via CAN line. To send command via CAN line with this functionality, the user must have:

  • FMB641 device
03.01.00.Rev.00 or newer firmware for (FMB641/FMC650/FMM650)
  • Transport or equipment with CAN interface which works via J1939 protocol
  • Transport or equipment CAN communication protocol (with information about frames, parameters, ID‘s, Baudrate)

Manual CAN Command I/O settings

User can configure up to 10 Manual CAN I/O commands by setting CAN Type, Data mask, CAN ID, Request Period, Request Data Length parameters. Each CAN I/O has its own parameter and can be configured independently.

(!) Functionality will work only when Ignition is ON

Baudrates are configurable in CAN \ Tachograph tab settings for connected CAN line which could be CAN1 or CAN2

  • Manual CAN Type parameter - defines which CAN ID type will be received and requested (Standard - 11bit, Extended - 29bit).
  • CAN ID/PGN - depends on CAN Type parameter and defines which CAN ID will be received by device
  • Data Mask - defines which data mask will be applied to received CAN data. CAN Data mask parameter is 8byte hex value. Displayed data value will be Received Data Value AND Data Mask. In other words - Data Mask parameter defines which data will be taken from the specific frame.
  • Request data length - defines data length of requested ID.
  • Send type – Could be selected with three different choices:
    • Once – it defines request will be sent once if Run On Startup is enabled
    • Periodic – it defines the request via CAN will be sent by set period in ms, for configured send count.
    • Response – it defines to which MANUAL CAN value will be sent.
  • Run On Startup – Enable/disable defines if on Ignition startup will be needed to send a command.

Configuration of Manual CAN commands

CAN1 bus settings.png


In the Tachograph/CAN section the user has to select suitable baudrate. Manual CAN baudrate should be visible in the CAN protocol. If it is not known, the user can try to choose different baudrates to indicate which one works.

Protocol example:

Frame ID Name Period [ms] Byte orientation Bit Description Scale factor Source addresses Priority
0x620 Range Estimation 1000 1 7:0 Estimated range km 1 km 17 1
0x300 Battery status On request 0
Average of the two batteries SoC %
SoC second battery %
Battery Current (A)
Battery Temperature (C)
Battery Voltage (V)
1 %
1 %
0,0625 A
0,1 C
0,046 V
18 2
0x451 Battery fast charging enable/disable 0:3
Battery charge enable
Battery charge disable
ON/OFF 19 3
0x301 Battery Status message request 0:1 5:0 00001 - request SOC 1st 18 2
00010 - request SOC 2nd
00100 - request Current
01000 - request temperature
10000 - request voltage
**0x452 Battery Fast charging mode switch status 0:1 2:0 01 - Charge enable
10 - Charge disabled
19 3
*0x453 Battery Fast charging mode switch 0:1 2:0 01 - Charge enable 19 3
10 - Charge disable

** - CAN ID to send CAN COMMAND
* - CAN ID to receive value in Manual CAN of CAN COMMAND

1. Select CAN Type. Normally every CAN protocol documentation should mention which CAN type to use. If it doesn't, select Extended.

2. Fill in the correct Data mask in Manual CAN command 0 setting. This field determines which IO elements of the frame the user will send via CAN line. As an example, the part of the CAN protocol was taken. First, the user has to locate the data frame he wants to send, for this situation, data frame „Battery Fast charging mode switch“ was taken into account. It holds two states - enable or disable. If we would like to send data of frame, in the configurator the user has to configure 0000000000000000 – to disable or 0000000000000001 - to enable.

3. For Manual CAN command 0 settings, CAN ID it must be written with Source addresses, Frame ID and Priority19045303, as you can see in Protocol example.

4. Request data length configured as 8 bytes.

5. Send type Once.

Manual can commands 1.png

6. To receive data if the command were permitted correctly in Manual CAN0 we will configure CAN Type Extended.

7. Data mask will have selected first two bytes (right to left) from LSB side.

8. CAN ID will be FF0452FF as we are only interested to receive information about the command status execution, for that reason, we ignore Source addresses and Priority ID's with FF.

Manual can IO 1.png

NOTE: Regarding "in Request" parameters shown in protocol, more information about CAN request functionality can be found here.