HIMA H4135 Displacement speed module

As described in other sections, a complete configuration of Serial Port 4 requires that you set the following jumper headers on the MVME2603/2604 or the transition module: 

❏ J16 (Serial Port 4 receive clock configuration) on MVME712Mcompatible versions of the base board ❏ J17 (Serial Port 4 transmit clock configuration) 

❏ J20 (Serial Port 4 transmit clock receiver buffer control) on MVME712M-compatible versions of the base board 

❏ J15 on the MVME712M transition module or J3 on the MVME761 (Serial Port 4 clock configuration) A transmit clock receiver buffer (controlled by header J20) is associated with Serial Port 4. Installing a jumper on J20 enables the buffer. Removing the jumper disables the buffer. The factory configuration has the Serial Port 4 buffer enabled.

Serial Port 3 Transmit Clock Configuration

 In synchronous serial communications using the MVME761 transition module, you can configure Serial Port 3 on the MVME2603/2604 to use the clock signals provided by the TxC signal line. On MVME761- compatible versions of the base board, header J18 configures port 3 to either drive or receive TxC. The factory configuration has port 3 set to receive TxC. J18 remains open on MVME712M-compatible versions. To complete the configuration of Serial Port 3, you must set J2 on the MVME761 transition module (Serial Port 3 clock configuration) as well.

System Controller Selection 

The MVME2603/2604 is factory-configured as a VMEbus system controller by jumper header J22. If you select the “automatic” system controller function by placing a jumper on J22 pins 2 and 3, the MVME2603/2604 determines whether it is the system controller by its position on the bus. If the board is in the first slot from the left, it configures itself as the system controller. If the MVME2603/2604 is not to be system controller under any circumstances, place the jumper on J22 pins 1 and 2. When the board is functioning as system controller, the SCON LED is turned on.

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