Siemens SIMATIC Box PC 820 Manual page 133

4.6.2 Internal Ports
4-Pin Power Supply Connector
4-pin male connector
Pin no. Signal designation
1 +5V
2 Ground
3 Ground
4 not assigned
DP Port
10-pin pole plug
Pin no. Signal designation
1 not assigned
3 Disable (control signal)
5 Ground
7 Ground
9 Ground
Keyboard Port
6-pin pole plug connector
Pin no. Signal designation
Pin 1 Ground
Pin 2 SLK
Pin 3 Ground
Pin 4 LATCH
Pin 5 Ground
Pin 6 DATA
Siemens Distributor
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
Direct Key Module (Optional with FI45)
Pin no. Signal designation
2 Disable power (control signal)
4 not assigned
6 TTL_RXD (TTL level)
8 TTL_TXD (TTL level)
10 TTL_RTS (TTL level)
Description
Ground
Clock signal for transmission of serial data from the
keyboard controller
Ground
Memory signal for data package from keyboard
controller
Ground
Serial data from keyboard controller
4-9