Specifications

152 Chapter 12
Connecting the Instrument to a Handler with the Handler Interface
Modification of the Handler Interface
Setting the jumper (J5)
J5 lets you set the output signal pull-up and input signal drive power supply and its
common. Setting one of the following jumpers selects external power supply (EXT_DCV)
or internal power supply (+5 V).
NOTE Set (short) only one from among J5-1 and J5-2. Do not set (short) two at the same time.
NOTE J5-3, J5-4, J5-5, J5-6, and J5-7 are not used at present. Do not connect anything to them.
Setting the switches (S1)
Each switch of the DIP switch (S1) must be set as follows, depending on the voltage setting
of the output signal pull-up and the input signal drive power supply (DCV).
Setting the pull-up resistors
The pull-up resistors for the output signals can be set using J3 and J4 on the A23 handler
interface board. Figure 12-6 shows the location of the pull-up resistors on the circuit
diagram where the resistor for each signal should be mounted. The location on the handler
interface board is shown in Figure 12-5. Refer to Table 12-4 for typical resistance values.
NOTE The resistors are not factory-mounted.
NOTE R2-5 and R2-8 are reserved; do not connect anything to them.
Socket
number
Power supply setting when the jumper is set (shorted) Factory
setting
J5-1
For the output signal pull-up and input signal drive power
supply, internal power supply (+5 V) is specified.
Open
J5-2
For the output signal pull-up and input signal drive power
supply, external power supply (EXT_DCV) is specified.
Short
J5-8
Short external common of handler interface to internal
common of 4287A.
Open
Voltage setting of output signal pull-up and input signal drive power supply (DCV)
5V £ DCV £ 6V 6V < DCV £ 9V 9V < DCV £ 15V 15V < DCV £ 24V
(factory setting)