PX 30 and PX 120 Operating Manual
3-5
1. Positive binary integer
2. Complementing (negation) of binary value
3. Add "1"
Example: "-21" as a signed 8-bit binary figure
1. "+21":
00010101
2.
11101010
3.
+ 00000001
4.
11101011 (on PX-unit): "-21"
Important: You will need to be in variable mode to use input E3 to switch between binary
and BCD-coding. Even in this case, binary coding will need to have been configured, or
the $M-configuration instruction will need to have been omitted!
Text Display with 24 Inputs (PX 120)
Note:
The PX 120 can be configured to use just 16 inputs (see page 6-1), making it fully
compatible with the PX 30. The function and layout of inputs in 16-input mode is de-
scribed from page 3-12 onwards.
Function and Layout of Inputs (general)
E23 = 0
Display Mode
Enable signal (positive-going pulse edge)
B/S
Operating Mode/Special Mode: 0/0 = Text Mode; 0/1: Special Mode;
1/0 = Variable Mode; (1/1 = reserved)
e
End of data transmission: 1 = last cycle
a
Start of data transmission: 1 = first cycle
s
Scroll inputs (E17 up; E16 down)
Text Mode
Binary Coding
The text number is interpreted as a signed 16-bit integer. Text numbers from 0 ... 9999
are accepted.
23 22 21 20 19 18 15
0
0
1
1
Text Number
w w w w w w w w w w w w w w w w
7
0
0
7
0
Input
23 22 21 20 19 18 17 16 15
S
e
a s
s
Control Inputs
Data Inputs
B
0
23 22
21 20 19 18
15
23 22
21 20 19 18
17
16 15
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