RELIANCE 45C15C Ladder control module

The MVME172LX uses two Zilog Z85230 serial port controllers to implement the four serial communications interfaces. Each interface supports CTS, DCD, RTS, and DTR control signals as well as the TXD and RXD transmit/receive data signals. Because the serial clocks are omitted in the MVME172LX implementation, serial communications are strictly asynchronous. The Z85230 is interfaced as DTE (data terminal equipment) with EIA-232-D signal levels. The serial ports are routed to four RJ-45 connectors on the front panel. For additional information on the EIA-232-D interface, refer to the EIA232-D Standard. Connection diagrams for the four serial ports on the MVME172LX are provided in the following figures. These ports are connected to external devices through cables connected to the front panel.

Startup and Operation

This chapter provides information on powering up the MVME172LX VME Embedded Controller after its installation in a system, and describes the functionality of the switches, status indicators, and I/O ports. For programming information, consult the MVME172 Embedded Controller Programmer’s Reference Guide. Front Panel Switches and Indicators There are two switches (ABORT and RESET) and four LED (light-emitting diode) status indicators (FAIL, RUN, SCON and FUSES) located on the MVME172LX front panel.

Abort Switch (ABORT) 

Sends an interrupt signal to the processor. The interrupt is normally used to abort program execution and return control to the debugger firmware located in the MVME172LX Flash memory. The interrupter connected to the ABT switch is an edge-sensitive circuit, filtered to remove switch bounce. Reset Switch (RESET) Resets all onboard devices. Also drives a SYSRESET* signal if the MVME172LX is system controller. SYSRESET* signals may be generated by the Reset switch, a power-up reset, a watchdog timeout, or by a control bit in the Local Control/Status Register (LCSR) in the VMEchip2 ASIC. For further details, refer to Chapter 4, Functional Description.

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