Can Interface, PSM, Function - GF54.21-D-3003PA

MODEL 906 with CODE ED5 (Parameterizable special module (PSM)) with CODE XM0 (Facelift) Interface description 

MODEL 906 with CODE ED8 (Preinstallation for parameterizable special module (PSM)) with CODE XM0 (Facelift) Interface description 

The PSM control unit is equipped with a 2nd Controller Area Network (CAN), which can also be used with the discrete inputs and outputs for exchanging data with the PSM control unit. The data that can be accessed via the body manufacturer CAN (CAN ABH) can be found in the "CAN matrix" in the document "CAN matrix, PSM, function".

The CAN-ABH can be activated by a signal fro the signal pool, e.g. with the 1018 (circuit 15 ON) signal.

Specification:

• High speed CAN class C, extended CAN identifier (29 bit)
• Baud rate can be switched between 250 kbit/s and 125 kbit/s
• Signal format = Intel (LSB first)
• Voltage (nominal) = 5 V
• Transceiver = TJA1041 (conforms to 11898)
• Terminating resistor for PSM control unit: 120 Ω

All CAN contents can be separated and activated independently of each other by means of parameterization.

If you connect only one further body manufacturer CAN control unit (except the PSM control unit) to the body manufacturer CAN, it should be fitted with a 120 Ω terminating resistor. If you use several control units on the body manufacturer CAN, then the last control unit should have a terminating resistor of 120 Ω, all other control units must have a terminating resistor of approx. 3.3 k Ω.

Fleet management system (FMS) 

The FMS only contains messages to be sent by the PSM control unit.

These messages contain the following information, for example:

• Vehicle speed
• Engine values
• Driver information

ISO11992-2/3 

This standard contains transmit and receive messages. The transmit messages contain information similar to that for FMS, with the addition of some items of engine information. The signals received from the PSM control unit are stored in a signal pool and can be used, for example, for working speed control.

Freely assignable messages 

The following freely assignable messages are available to the user:

• In the transmission direction, 4 messages (GPM_1H, GPM_1I, GPM_1J, GPM_1K)
• In the reception direction, 4 messages (GPM_2H, GPM_2I, GPM_2J, GPM_2K)

To send the content of a PSM signal to the body manufacturer CAN, the following is required:

• A suitable internal input on the "body manufacturer CAN bus" module has to be selected
• This internal input has to be assigned to a suitable signal ID from the signal pool

The receive signals are stored in the signal pool to await further use.

The signals are given the designation "AuxBit, AuxByte" etc.

Details can be found in the document "Signal lists, PSM, function".

Activation of the freely assignable messages is only possible if the message package ISO11992-2/3 has also been activated. Otherwise the transmission messages from the PSM control unit (GPM_1H, GPM_1I, GPM_1J and GPM_1K) are not sent.

Structure of messages:

• 8 bit signals
• 2 byte signals
• 2 2-byte signals
• Cycle times of sent messages:
  • 2 x with 100 ms
  • 1 x with 500 ms
  • 1 x with 1000 ms

The precise contents can be found in the "CAN matrix" in the documents "CAN matrix, PSM, function".

Parameterization for body manufacturer CAN release 

The following parameters must be set when using the body manufacturer CAN:

• Body manufacturer CAN bus ACTIVATED/DEACTIVATED
• "FMS standard" message package ACTIVATED/DEACTIVATED
• "ISO11992-2/3" message package ACTIVATED/DEACTIVATED
• Baud rate 125 kbit/s or 250 kbit/s
• Activation of free messages (signal group 1-4)

Parameterizable special module (PSM) control unit component description

GF54.21-D-5005P