Agilent Technologies TV 303 Notice De Mode D'emploi page 224

17 Technical Information
Interconnections
Figure 17
How to Connect the Outputs of the Controller
The following figure shows a typical logic output connection (relay
coil) but any other device may be connected e.g. a LED, a computer,
etc., and the related simplified circuit of the controller. The figure
example refers to the programmable set point signal on pins 11 and
9.
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Case 2 with transistor utilisation
TV 303 User Manual / 87-901-019-01 (A)