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
00
11
Text Number
w w w w w w w w w w w w w w w w
70
0
7
0
Input
23 22 21 20 19 18 17 16 15
Seass
Control Inputs Data Inputs
B0
23 22 21 20 19 18 15
23 22 21 20 19 18 17 16 15
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