HP 340 Series Service Manual page 65

Link Controller
A block diagranl of a typical link controller is shown in Figure 3-6.
I
Power
I
+12V
Supply
I
-
GND
-
HP-HIL Data
so
SI
HP-HIL Data
Computer
Li'lk
Interface
;1
r'\
\r
-V
System
Micro-
processor
System-Specific
V1-
1\
Components
N
-V
Figure 3-6. HP-HIL Link Controller Block Diagram
Power Supply. One voltage, +12 Vdc is taken from the SPU and output as a regulated power
supply to external devices on the link. Up to 1 A can be supplied to devices. When configuring
HP-HIL devices with Series 300 computers, care must be used to ensure the total power drawn
by all devices does not exceed 1 A. In Table 3-3, devices are listed with their power requirements.
Functional Description
53