Red Lion GEMINI 42 - Manual (Page 11)

PROGRAMMING INSTRUCTIONS FOR THE COUNTER/RATE VERSION OF THE GEMINI 4000
The first part of this section provides detailed descriptions of the function
command codes for inputs response modes, reset modes, output terminations,
etc. Then, using an actual application example, the programming instructions for
a Counter/Rate version will be “walked through”, to give the user a full
understanding of the Gemini programming procedure. The descriptions below
give the function command code first, followed by the individual mode
identifier. The Function Command Code Summary in the appendix, lists all
codes. (Only commands and modes pertaining to the Counter/Rate personality
will be discussed in this section.)
CODE 41 - UNIT PERSONALITY
The Gemini can be programmed to operate in one of two different
personalities. In each of the two unit personalities, the Gemini operates as a dual
function indicator. The personality selected determines whether display channel
A will indicate rate or count. In both personalities, display channel B operates as
a counter.
When the Unit Personality is changed and entered, all modes and data values
(Preset, Scale Factors, function codes etc.) will be automatically loaded with the
factory settings for that personality. If, for any reason during programming, it is
desired to return to the factory settings (while in code 41), the “+/-” key can be
pushed. When the “E” key is pressed the unit will load the factory settings into
the Gemini.
The programming procedure will vary for the two unit personalities. This entire
section deals with the unit programmed as a Counter/Rate indicator, [41 1].
[41 1] COUNTER (B)/RATE (A) - In this mode, display channel A functions as
a rate indicator and display channel B functions as a counter. See the
“PROGRAMMING INSTRUCTIONS FOR THE GEMINI 4000” section
for details.
[41 2] DUAL COUNTER - In this mode, both display channels, A & B, function
as counters.
CODE 42 - RESET BUTTON & TERMINAL ACTUATION MODES
The “Reset Button & Terminal Actuation Modes” controls the affect that the
reset button and terminal have on the two display channels. Resetting will not
affect the rate display in any manner. If the output(s) is assigned to the rate
channel, activating the reset button or terminal will reset the rate output(s) if that
particular response mode is programmed. Resetting counter (B) will always reset
the assigned output(s).
There is a separate “RST. A” terminal, which resets the Rate (A) output when
activated (if output(s) is assigned to rate). It is provided to allow independent
resetting of each channel.
[42 1] RESET RATE (A) OUTPUT(S)
[42 2] RESET COUNTER (B)
[42 3] RESET RATE (A) OUTPUT(S) AND COUNTER (B)
CODE 43 - INPUTS 1 & 2 RESPONSE MODES
The Gemini has six different input response modes. They are: Count(1) with
Inhibit(2); Count(1) with Up/Down Control (2); Two input anticoincidence
Add(1)/Subtract(2); Separate Input mode; Quadrature; and Quadrature x4. In all
modes, except [43 4], Input 1 is used by both the counter and rate channels.
[43 1] COUNT WITH INHIBIT - Input 1 serves as the count and rate input. Input
2 serves as the Inhibit input. When Input 2 is low, the counter will ignore the
count signal appearing at Input 1. The rate channel, however, will continue to
indicate the rate of the signal on Input 1.
When Input 2 is at a high level, the signal appearing on Input 1 will be counted.
The “Counter (B) Reset Modes” will determine the count direction. In
applications where the Inhibit function is not actually used, the Input 2
“SRC/SNK” position of the “INPUT CONFIGURATION DIP SWITCH”
should be set to the “SNK” position to provide a 7.8 Kohm pull-up resistor.
This will set Input 2 to the Non-Inhibit state.
-9-