91500 Revision B
18
DiCon Fiberoptics VX500 Fiberoptic Switch
Controlling the VX500 Using a PC Printer Port
It is possible to control the VX500 switch by connecting the interface board to a PC printer
port and a power supply (+12VDC ±5%, 300 mA max.). The printer port has a 25-pin, D-
shell connector. The recommended cable configuration for connection to the printer port is
shown in Figure 15. The basic control flow for the VX500 is illustrated in Figure 14. For spe-
cific procedures for sending reset and switch instructions, see “Switch Operation” on page
7, “Timing Parameters” on page 15, and “Selecting an Output Channel” on page 8.
Figure 14: Switch Control Flow
Wait for
970 ms.
Power-Up
+12 VDC
Send reset
instruction
STOP!
Send for service
Send switch
instruction
Is the
ERROR signal
high?
Is the
ERROR signal
still high?
Is the
BUSY signal
high?
START
Yes
No
Yes
No
No
Yes