HIMA F3215A Displacement speed module

Another subject that needs to be considered is the use of ground pins. There are two pins labeled GND. Pin 7 is the SIGNAL GROUND and must be connected to the distant device to complete the circuit. Pin 1 is the CHASSIS GROUND, but it must be used with care. The chassis is connected to the power ground through the green wire in the power cord and must be connected to the chassis to be in compliance with the electrical code. The problem is that when units are connected to different electrical outlets, there may be several volts difference in ground potential. If pin 1 of the devices are interconnected with a cable, several amperes of current could result. This not only may be dangerous for the small wires in a typical cable, but could result in electrical noise that could cause errors. That is the reason that Figure A-1 shows no connection for pin 1. Normally, pin 7 should only be connected to the CHASSIS GROUND at one point and, if several terminals are used with one computer, the logical place for that point is at the computer. The terminals should not have a connection between the logic ground return and the chassis.

This chapter describes the board level 

hardware features of the MVME197LE Single Board Computer. The chapter is organized with a board level overview and features listed in this introduction, followed by a more detailed hardware functional description. Front panel switches and indicators are included in the detailed hardware functional description. This chapter closes with some general memory maps. All programmable registers in the MVME197LE module reside in ASICs (Application-Specific Integrated Circuits) that are covered in the MVME197LE, MVME197DP, and MVME197SP Single Board Computers Programmer’s Reference Guide.

The MVME197LE module is a double-high VMEmodule 

based on the MC88110 RISC microprocessor. The MVME197LE has 32/64MB of DRAM, 1MB of flash memory, 8KB of static RAM (with battery backup), a time of day clock (with battery backup), an Ethernet transceiver interface, four serial ports with EIA-232-D interface, six tick timers, a watchdog timer, 128KB of BOOT ROM, a SCSI bus interface with DMA (Direct Memory Access), a Centronics printer port, an A16/A24/A32/D8/D16/D32 VMEbus master/slave interface, and a VMEbus system controller.

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