B&B Electronics 3PXCC2a Spezifikationen PDF herunterladen (Seite 12)

AE/LZB 119 1894 R1A INTERCONNECTING THE EQUIPMENT

Control Data Link

Overview

Either an RS-422 (four-wire) or an RS-232 (three-wire)

full-duplex serial control data link may be employed

between the console and the CIM within the CEC/IMC.

Since RS-422 interfacing is superior to RS-232, PCs used

within the C3 Maestro console normally ship from the

factory with an RS-422 serial port provided for this purpose.

RS-232 has poorer noise performance than RS-422 and

therefore, it should never be used for cable runs more than

50 feet (15.2 meters) in length. RS-422 connections may be

up to 4000 feet (1219 meters) in length.

If required for a remote console installation, full-duplex

4-wire data modems can be used between the C3 Maestro

and the CEC/IMC. Typically, the PC-to-modem and

modem-to-CEC/IMC interconnections must be made via

RS-232 interconnections since many data modems do not

provide RS-422 hook-ups. These RS-232 interconnections

should also not exceed 50 feet (15.2 meters) in length. See

the following sections for additional remote console wiring

and modem configuration details.

At the C3 Maestro, RS-422/RS-232 serial control data

connections terminate at one of the PC's serial COM ports.

Normally, COM3 is utilized for CEC/IMC CIM interfacing.

Typically, this serial port is provided by a plug-in RS-422

board inside the PC as described in the following section.

The following table summarizes basic usage of all serial

COM ports available at the PC in a standard console

equipment package.

Table 5 - Standard Serial COM Port Utilization

(Factory Default Configurations Unless Noted)

SERIAL

COM

PORT

RS-232

RS-422

SERIAL LINK

USED FOR

INTERFACING

PC COM1 RS-232 Enhanced Audio Enclosure

PC COM2 RS-232

touch-screen data from

touch-screen monitor *

plug-in

RS-422 board

set as COM3

RS-422

CEC/IMC

CIM *

* If the console is not equipped with a touch-screen monitor and

RS-232 interfacing to a modem via a DB-9 connector at the PC is

required, PC serial port COM2 may be utilized for interfacing to

the CIM link’s modem at the console. Software COM port setting

changes from the factory default settings

are

necessary.

**The plug-in RS-422 board may be reconfigured for RS-232

interfacing if RS-232 interfacing to a modem via a DB-25

connector is required. Reconfigurations are accomplished via

jumper position changes on the plug-in RS-232 board. Software

setting changes from the factory default settings

are not

necessary.

RS-422 Interfacing (Co-Located Hook-Ups)

In most cases, the PC used in the C3 Maestro console

system is

not

equipped with a main ("mother") board

RS-422 capable serial COM port. Therefore, a plug-in

RS-422 capable interface board is installed in one of the

PC's internal expansion slots and utilized for CEC/IMC CIM

control data interfacing.

Currently approved (factory installed) plug-in RS-422

board is manufactured by B&B Electronics. Its model

number is 3PXOCC1A (part number 344A3927P38) and it

is an optically-isolated serial board. Subsequent to the

writing of this manual, additional boards may be approved.

Factory-installed plug-in RS-422 boards are configured

correctly before the PC ships from the factory. This

configuration includes setting DIP switches and jumpers on

the plug-in board and disabling the PC's main board serial

COM port per manufacturer's instructions.

Factory configuration for the 3PXOCC1A board

follows. This single-port RS-422 board has one DB-25

connector:

Address Switches (S1)

(MSB)

1111101

(LSB)

= 3E8 Base Hex Address

422/232 Jumpers

JP1A

−

JP1D

“422” positions

RTS/SD Jumper

JP2 (any position)

422/485 Jumpers

JP3TX and JP3RX

“422” positions

Interrupt Jumper

JP4 “IRQ11” position

UART Clock Jumper

JP5 “*1” position

* See footnote

below.

Some early C3 Maestro console for Windows NT PCs

shipped with a substitute B&B Electronics plug-in RS-422

board, model number 3PXCC2A. RS-422 configuration for

this dual-port board with DB-9 connectors is (PORT 1

only):

If COM1: Address

Switches (S1)

(MSB)

1111111

(LSB)

= 3F8 Base Hex Address

If COM3: Address

Switches (S1)

(MSB)

1111101

(LSB)

= 3E8 Base Hex Address

422/485/232 Jumpers

JP1A

−

JP1C and JP1F

“422” positions

RTS/SD Jumper JP1D (any position)

RX Termination

Jumper JP1E

“Rt OUT” position

If COM1: Interrupt

Jumper JP3

“4” position

All jumper numbers correspond to 3PXOCC1A boards shipping

mid-1996 (and later). If jumper numbering differs on supplied 3PXOCC1A

board, refer to the appropriate B&B Electronics manual for jumper

identification information.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 47 48

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