IDEC DD3S Series, Manual

Page: 9 / 32

9
DD3S
Series
Display Units
(Zero-suppress Unit)
Leading zeros are suppressed using the RBI (No. 1) and RBO (No. 11) terminals. For other
inputs, see the lower table on the preceding page.
Decimal/Hexadecimal/Extra Decimal
Data Input
LED
Display
Positive Logic Negative Logic
X Latch LT BL DP RBI RBO Y Latch LT BL DP RBI RBO
× × H × × × # × × L × × × & 8.
× × L H × × # × × H L × × & blank
H L L L L L L H H H H H L L blank
H L L L L H H H H H H H H H 0
H L L L H L H H H H H L L H 0.
L L L L L L H L H H H H L H
*
X: X = A · B · C · D * : Any display
Y: Y = A · B · C · D #: # = DP · RBI · X
×: Either H or L &: & = DP · RBI · Y
Note: RBI and RBO operate in the negative logic mode on both positive and negative logic units.
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
RBI RBO
1st Digit 2nd Digit 3rd Digit 4th Digit
[Ex. 1]
[Ex. 2]
[Ex. 3]
[Ex. 4]
L or
H
L or
H
DP
DP
Application Examples of RBI and RBO
[Ex.1] Leading zeros are also displayed. RBI and RBO outputs are
disconnected.
[Ex.2] Leading zeros on the upper three digits are suppressed. When the data
on the 1st digit is zero, 0 is displayed.
[Ex.3] Zero on the 4th digit is suppressed. Zero and decimal point are
displayed on the 3rd digit.
[Ex.4] Trailing zeros on the 2nd and 1st digits are suppressed. When the data
on the 1st and 4th digits are zero, and the decimal point on the 4th digit
is on, 0.0 is displayed with zeros on the 2nd and 1st digits suppressed.
Note: Use the RBO output only for connection to the RBI input. Do not use the RBO for
other connections.
Input and Output Functions
RBI Input
When 0 is displayed and the decimal
point is turned off, the display is
blanked by setting the RBI input to
level L.
RBO Output
The RBO output remains in level L
during zero blanking. Leading zeros
can be suppressed by connecting the
RBO to the RBI on the lower digits.
The RBO output is an open collector output.
(Character Display Unit)
Data Input
LED
Display
Positive Logic Negative Logic
D0 to D7 Latch BL D0 to D7 Latch BL
∆ L L ∆ H H ∆ (Note1)
× × H × × L blank
× H × × L × maintain (Note3)
Note 1: Refer to the character display patterns on the next page.
Note 2: Display is not affected whether × is level H or L.
Note 3: Data (D0 to D7) immediately before the Latch signal is input is maintained.
Input Functions
Latch Input
When the Latch Input is set to level H
for the positive logic or level L for the
negative logic, the display at the time
is maintained.
BL (Blank) Input
When the BL input is set to level H
for the positive logic or level L for the
negative logic, the entire display turns
off regardless of other inputs.