Fluke 2625A User Manual
IEEE-488 Option -05
General Maintenance
General Maintenance
7
7-5
7-7. IEEE-488
Transceivers/Connector
The IEEE-488 Transceivers (A5U2 and A5U3) are octal transceivers that are specifically
designed to exhibit the proper electrical drive characteristics to meet the IEEE-488
standard. These transceivers are configured to match the control signals available on the
IEEE-488 Controller. Assuming that A5U1-33 is always high, Table 7-2 describes the
transceiver direction control. The IEEE-488 Transceivers connect to a 24-position
connector (A5J2), which mates with the ribbon cable leading to the IEEE-488 connector
mounted at the rear of the instrument chassis.
designed to exhibit the proper electrical drive characteristics to meet the IEEE-488
standard. These transceivers are configured to match the control signals available on the
IEEE-488 Controller. Assuming that A5U1-33 is always high, Table 7-2 describes the
transceiver direction control. The IEEE-488 Transceivers connect to a 24-position
connector (A5J2), which mates with the ribbon cable leading to the IEEE-488 connector
mounted at the rear of the instrument chassis.
Table 7-2. IEEE-488 Transceiver Control
TRANSCEIVER
TE = 0 (LISTENER)
TE = 1 (TALKER)
DI01..DI08
SRQ
ATN
EOI
-
DAV
NRFD
NDAC
IFC
REN
SRQ
ATN
EOI
-
DAV
NRFD
NDAC
IFC
REN
Receiver
Transmitter
Receiver
Receiver
Receiver
Receiver
Transmitter
Transmitter
Receiver
Receiver
Transmitter
Receiver
Receiver
Receiver
Receiver
Transmitter
Transmitter
Receiver
Receiver
Transmitter
Transmitter
Receiver
Receiver (ATN = 0)
Transmitter (ATN = 1)
Transmitter
Receiver
Receiver
Receiver
Receiver
Transmitter
Receiver
Receiver (ATN = 0)
Transmitter (ATN = 1)
Transmitter
Receiver
Receiver
Receiver
Receiver
7-8. General
Maintenance
7-9.
Removing the IEEE-488 Option
Remove the instrument cover as shown in Figure 7-1. Then remove the IEEE-488 Option
with the following procedure:
with the following procedure:
Note
Parts referenced by letter (e.g., A) are shown in Section 3 (Figure 3-4.)
1.
From the bottom of the instrument, locate the IEEE-488 PCA (N). This pca is
connected to the front of Main PCA, with a ribbon cable (O) leading across both
pca’s to the Rear Panel. Refer to Figure 7-1.
connected to the front of Main PCA, with a ribbon cable (O) leading across both
pca’s to the Rear Panel. Refer to Figure 7-1.
2.
Use needle nose pliers to disconnect the 24-line cable assembly at the IEEE-488
PCA, alternately pulling on each end of the cable connector. Leave the other end of
this cable attached to its Rear Panel connector.
PCA, alternately pulling on each end of the cable connector. Leave the other end of
this cable attached to its Rear Panel connector.
3.
Remove the 6-32, 1/4-inch panhead Phillips screw (P) securing the IEEE-488 PCA.
See Figure 7-1.
See Figure 7-1.
4.
Disengage the IEEE-488 PCA by sliding it away from the Main PCA.