Unit installation

12-24

096: Control or Recall Extended Output Lines

“Extended” output lines provide a way to control more external devices or signals than the number

of output lines built into the controller (8 per I/O board). By connecting external shift registers

such as are used on many BCD boards to three of the controller's output lines, you can control up

to 64 “extended” output lines. Whenever command 096 is executed to set or recall the state of an

output line, the controller shifts out 64 bits of information representing the state of each of the

outputs. Extended output line 64 is shifted out first, line 1 last. The data is also shifted out when

the controller is reset and the extended outputs are enabled (you should not enable the extended

output lines if you are not using them, or output lines 6, 7 and 8 on I/O board 1 will get messed up

every time the controller resets).

<096> 0 Disable the extended output lines (the default)

<096> 1 Enable the extended output lines

<096> xx Recall the state of extended output line “xx”

<096> xx 1 Turn extended output line “xx” on

<096> xx 0 Turn extended output line “xx” off

Parameters:

XX - the extended output line number (two digits, 01..64)

Details:

Most standard shift registers should be compatible with this command. Up to eight 8-bit shift

registers can be chained together, each one providing eight more extended outputs. If the shift

registers have separate output registers (like the 74HC595 or 4094), the latch line can be used to

keep the outputs from rippling each time new data is shifted in.

I/O Board 1 Description

Output Line Number

6 Latch - Optional, but will prevent the lines

from “rippling” as data is shifted if used

7 Clock - pulses 64 times to shift data out

8 Data - goes high or low for each clock pulse.