B&B Electronics 1939STB Benutzerhandbuch

30 1939STB4600

Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445

Function

This is used to show where the message came from. Refer to Table 37. If

the Nibble 2 is set to 0, then the message is from the J1939 bus. If Nibble 2 is
set to 2, it is an internal message (for example, Vendor ID).

This is a byte from the controller. Nibble 2 is the number of data bytes (0-

8) in the message. Nibble 1, Bit 3 is the message direction. Bit 2 should
always be set to 1. Bit 1 and 0 are not used.

Table 38. MC

Nibble 2

Nibble 1

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0