Pathway DMX Pathfinder CR Manual Manuel d'utilisateur télécharger pdf (Page 32)

DMX Distribution System Page 32

DMXPathfinder - Hardware

.1 MASTER CONTROL MODULE -- DMS-MCM

The main functions of the Master Control Module are to provide a

communications link with a separate personal computer, provide local

memory storage for patch information and the means for downloading it to

the Input/Output Modules, and to monitor for system activity and status. It

also acts as a buffer for system I/O data between the Input Modules and the

system I/O bus. The Master Module incorporates the following hardware

subsections:

Processor Section (Sheet 1) -- The processor section is comprised of the

microprocessor U22, watchdog timer/reset controller U21 with reset

pushbutton S2, address latch U23, lithium SRAM module U27, EPROM U28,

and options DIP switch S3 with buffer U24. The DIP switch settings are as

follows:

PC Baud Rate 1 2 3

300 on on on

1200 off on on

2400 on off on

9600 off off on

19200 on on off

4: not used

5: on for PC COM echo test, off in normal run mode

6: on for multi-frame system

off for single-frame system

U29, U30 and U33 comprise a data transmit/receive section which provides

for the movement of commands, patch data and status information between

the Master Module and the Input Modules in the master frame, and the

Frame Control and Output Modules over the system COM bus (FCRxD and

FCTxD). "Phantom DMX" data is sent and received during diagnostic

sessions (DATAOUT and DATAIN). Buffers U8 and differential driver U11

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Pathway DMX Pathfinder CR Manual Manuel d'utilisateur Page 32