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Dis-allowed Connections
Do NOT connect these pins on E1432/3A end of cabling. These signals and
supplies are provided for HP specified break out boxes and are unspecified
for other usage.
Do not use:
15 I2C_EN
17 I2C_SDA
21 I2C_SCL
16 RFI GND/I2C Shield
18 RFI GND/I2C Shield
22 RFI GND/I2C Shield
19 BOB_EN
7 CAL_LOW
20 CAL_HIGH
23 -24 V Power
24 +/-24 V GND Return
25 +24 V Power
In general:
q +/- DIFF n lines are the differential inputs for each channel. Shielded
twisted-pair is recommended.
q RFI GND/Drain Shield n are the grounds for the shield on the twisted-pair for
each input channel. Connect at the HP E1432A/33A end of the cable only.
q RFI GND/Cable Shield are the grounds for a shield around the entire cable, and
the ground points for making individual channels single-ended.
q I2C_xxx supply control signals to the active break out boxes. We do not provide
support for other usage. These are not used with the HP E3240/1A Voltage and
Voltage/ICP break out boxes.
q RFI GND/I2C Shield protects the analog input lines.
q BOB_EN is another break out box control signal. We do not provide support for
its usage for anything but certain HP-specified break out boxes.
q CAL_HIGH/LOW are signal lines to send calibration signals to the HP-specified
break out boxes. The signals available on these lines are not specified and their
usage is discouraged.
q +/- 24V Power and GND supply power to the signal conditioning circuitry in the
active break out boxes, and ICP in the active ICP break out box. The power
available on these lines is not specified and their usage is discouraged.
HP E1433A User's Guide
Break Out Boxes
8-8