VXI Technology, Inc.
22
SMP7500 Programming
H
ARDWARE
R
ESISTOR
N
ETWORK
P
ULL
-U
P
S
ELECTION
The SMP7500 module contains user selectable hardware resistor networks that are used to pull-up
the F/P data lines to the selected CLAMP voltage. The networks are of the 9-pin 8-resistor single-
in-line (SIP) type. Examples of this type of resistor network are:
Dale Electronics, Inc
CSC09A01104G (100 k
Ω
)
BI Technologies
BH9-1104 (100 k
Ω
)
Pin 1
R
R
R
R
R
R
R
R
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
F
IGURE
2-3:
R
ESISTOR
N
ETWORK
9P8R
SIP
The values of these resistor networks may be selected and the networks replaced per customer
requirements. Care should be taken to follow the power rating of the networks selected and the
application voltage used so as not to create a potenially dangerous situation. VXI Technology,
Inc. does not carry other values of these resistor networks.
Front Panel CLAMP Lines
The F/P CLAMP lines are available for user defined voltages that are to be used to suppress
inductive fly-back transients on the PORT lines. This helps protect other circuitry on the PORT’s
data lines from an over-voltage condition. The F/P CLAMP line is only one of several sources that
may be selected to drive the fly-back protection diodes that are installed on the module. Hardware
selectable jumpers on the module can also be used to select 24 VDC, +12 VDC, or
+5 VDC. The voltage selected is routed to the cathode of a fly-back protection diode, whose
anode is then connected to the associated PORT’s data line. Every PORT data line has a fly-back
protection diode installed. If no protection voltage is desired, simply hardware jumper the clamp
voltage to the F/P CLAMP line and do not connect that line to any voltage.
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