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4. Description of the Assemblies 4.1 CAN Interface 4.1.1 Bitrate Description of the Assemblies The transmission speed can be varied from 10 kbit/s to 1.0 Mbit/s. The selection of the bit rate is made by the configuration field X100. The local software of the module provides the possibility to reprogram the bit rate. The programmed bit rate replaces the bit rate adjusted by X100. Further information about this can be taken from the software manual of the module. A detailed overview of the possible bit rates can be taken from the description of jumper clip X100 (see page 16). 1.5.2 Transmit and Receive Circuit of the CAN Interface (Physical Layer) The physical CAN interface of esd complies with the ISO 11898 standard. The connection to the bus occurs by a 5-pin Combicon connector. The voltage supply of the CAN bus is electrically isolated from the 24 V supply and the microcontroller C505. The electrical isolation of the signals to the CAN bus is realized by optocouplers. CAN-CBM-COM1 Hardware Manual Rev. 1.1 19
Description of the Assemblies 4.2 Serial Interface X300 (12-pin Combicon, male) 4.2.1 Configuration The serial Interface of the CAN-CBM-COM1 can be configured as RS-232, RS-422, RS-485 or TTY interface, depending on the insertion of driver (for RS-232) and piggyback (for RS-422, RS-485 and TTY). The interface is controlled by the microcontroller component C505. To buffer the serial data 256 bytes memory is supported for both data directions. The maximum possible bit rate of the serial interfaces is limited by the selected physical layer: 20 Physical Interface Bit Rate RS-232 RS-422 RS-485 TTY max. ca. 38,4 kbit/s max. ca. 125 kbit/s max. ca. 125 kbit/s typical: 1200 bit/s Table 4.2.1: Bit rates of the serial interface CAN-CBM-COM1 Hardware Manual Rev. 1.1
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Page 7 and 8: i Overview The ISO 11898-compatible
Page 9 and 10: i Overview 1.2.2 CAN- and Microcont
Page 11 and 12: i Overview Order Information 1.3 Or
Page 13 and 14: LED Display 2.3 LED Display The mod
Page 15 and 16: LED Display 2.3.2 State of Red and
Page 17 and 18: Hardware Configuration 3.2 Jumpers
Page 19 and 20: Hardware Configuration Bit rate (D6
Page 21: Hardware Configuration 3.2.2.2 CAN
Page 25 and 26: 22 Description of the Assemblies 4.
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Page 29 and 30: Connector Assignment 5.1 CAN-Interf
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Page 33 and 34: Cabling 30 Wiring for devices whic
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