Assignment Of The Front Ports On The Motherboard - Siemens SIMATIC Panel PC 870 Equipment Manual

Hardware Information
7.5.2

Assignment of the front ports on the motherboard

Interface Position
Display IF (LVDS)
internal
I/O front-panel IF
COM 2
Display port (LVDS), X400
The TFT displays of the PC 670/870 with LVDS interface are connected to this
port. The display clock rate is between 20 MHz and 66 MHz.
Connector pin assignment:
Pin Short
No. Name
1 P5V_D_fused
2 P5V_D_fused
3 RXIN0–
4 RXIN0+
5 P3V3_D_fused
6 P3V3_D_fused
7 RXIN1–
8 RXIN1+
9
GND
10
11 RXIN2–
12 RXIN2+
13
GND
14
15 RXCLKIN–
16 RXCLKIN+
17
GND
18
19 Reserved
20 Reserved
7-14
Connec- Description
tor
X300 Connection of LC display with single chip, LVDS
port
X44 Port for front-panel I/O
X33 Internal COM2 port
Meaning
+5V (fused) Display VCC
+5V (fused) Display VCC
LVDS output signal, bit 0 (–)
LVDS output signal, bit 0 (+)
+3,3V (fused), display VCC
+3,3V (fused), display VCC
LVDS output signal, bit 1 (–)
LVDS output signal, bit 1 (+)
Ground
LVDS output signal, bit 2 (–)
LVDS output signal, bit 2 (+)
Ground
LVDS clock signal (–)
LVDS clock signal (+)
Ground
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
Release 11/02
Input / Output
Output
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Output
-
Output
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