Measurement Computing Extender488 - Manual (Page 15)

Section 2 Getting Started
2. 5
2.3 Extender488/F CONFIGURATION
The following describes the configuration necessary for the fiber optic Extender488/Fs. If you are
using the RS-422 extenders, refer to Section 2.2.
Two Extender488/Fs are required to accomplish bus extension, with one connected 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.
WARNING
There are no user serviceable parts or us er selectable parameters inside the
Extender488/F case. Refer all servicing to qualified repair personnel. R efer to
Section 4 for additional information.
2.3.1 Extender488/F Fiber Optic Connections
The Extender488/F requires duplex fiber optic cabling. Most cable manufacturers mark the
two connectors at each end of t he duplex cable with a " T" and an " R" to distinguish which to
connect to the transmitter ( T) and which to c onnect to the receiver (R). Connect the fiber optic
cables as shown below. The Transmitter of #1 is connected to the receiver of #2 and visa verse.