SX-01635-000, Rev. 5
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assembly TRIAX output connector - the negative lead is wired to the center pin. If you decide to
connect your own photodiode detector to the SC-5500, you may need to reverse the detector
leads. A simple electrical diagram is shown in Figure 6. The Thermopile/Lead Sulfide/PMT con-
nector is wired in the normal fashion. Both connectors on the SC-5500 instrument are TRIAX
configured. You may need an adapter if your detector uses a BNC cable.
SC-5500 Computer Interface
The rear panel of the SC-5500 provides standard RS-232C and IEEE-488 connectors for main-
taining communications with the computer. You can elect to use either communications proto-
col. If your integrating sphere system includes one or more peripheral instruments, you must
establish a computer link for control of these devices.
If you decide to use the IEEE-488 computer interface, you will need a GPIB board and IEEE-
488 cable. Normally, these items are not provided by Labsphere. The default IEEE address for
the SC-5500 and most Labsphere software applications is 10. Values between 1 and 15 are possi-
ble. To set the primary address on the radiometer, scroll to the IEEE ADDRESS menu option
using the OPTIONS button and select your new address using the Up
∆
and Down
∇
buttons on
the front panel. Refer to your system manual when setting the IEEE address in your software
application.
You will need a null modem if you decide to use the RS-232C communications interface. If your
SC-5500 was purchased as part of an integrating sphere system, the null modem is provided.
Refer to your system manual when configuring the serial port in your software application.
Lamp Power Supply, Detector Multiplexer and Variable Attenuator Operation
A custom designed cable connecting the SC-5500 with a lamp power supply, variable attenuator,
detector multiplexer, or other peripheral accessory normally is supplied when your SC-5500 is
part of an integrating sphere system. This cable connects to the DB37 connector on the rear
panel of the radiometer and the input connectors of your peripheral equipment. A total of 32 out-
put bits are provided on the DIGITAL OUTPUT CONTROL connector. The pinout for the con-
nector is given in Table 2. There are no input bits.
Not all 32 bits over the DIGITAL OUTPUT CONTROL port are available for custom use. The
DM-1000, VAC-1000 and lamp power supplies all utilize a certain number of the bits. The num-
ber and identification of the bits available to the user depends on system configuration. The lamp
power supplies each use up a single bit, for example. The bits utilized by the VAC-1000 depend
on the number of variable attenuator units attached. A map describing the utilization of SC-5500
output bits is provided in Appendix B.
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