Measurement-computing Extender488 Instrukcja Użytkownika Pobierz pdf (Strona 12)

Section 2 Getting Started

2.2 Extender488 CONFIGURATION

The following describes the configuration necessary for the RS-422

Extender488

s. If you are using

the fiber optic extenders, refer to Section 2.3.

Two

Extender488

s are required to accomplish bus extension, with one c onnected directly to the

LOCAL

IEEE bus, and the other connected to the

REMOTE

IEEE bus.

Both local and remote extenders

are identical. At power up, each extender monitors the Attention

(ATN) and Remote Enable (REN) lines. The Error LED on each extender will blink indicating that ATN or

REN has not yet been detected and that communication with the other extender has not yet been

established. The first extender to detect either of these lines asserted declares itself the

LOCAL

extender

and commands the other extender to declare itself the

REMOTE

extender. The Error LEDs will now stop

blinking. From this moment on, the

LOCAL

extender will monitor all local bus activity and transmit this

activity to the

REMOTE

extender. All activity detected by the

REMOTE

extender is also communicated

back to the

LOCAL

extender.

2.2.1 Extender488 Serial Baud Rate Selection

The

Extender488

is shipped with the serial baud rate set to 115.2K baud. For most

applications, this is the most efficient

operating rate. However, if the extenders are to be located at

extreme distances from each other, baud rates other than 115.2K can be selected. Selectable baud

rates include 115.2K, 19.2K, 9600, 4800, 2400, 1200, 600, 300. Both extenders must be set to the

same baud rate for proper operation.

To modify the baud rate, follow this simple procedure: Disconnect the power supply from

the AC line and from the interface. Disconnect any IEEE or serial cables prior to disassembly.

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