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NE-4100 Series User’s Manual Panel Layout and Pin Assignments
2-12
NE-4120-ST Pinouts
Debug Serial Port for Serial Console RS-232 Port for Serial Devices
2
3
5
Pin
2
3
5
Signal
RXD
TXD
GND
1
6
2
7
3
8
4
5
Pin
1
2
3
4
5
6
7
8
Signal
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
Serial and DIO Terminal Blocks
TXD+ D0 D1 D2 D3TXD- RXD+ RXD-
Data+ Data-
SGND
Block Diagrams
NE-4120S Block Diagram
Pin header
1 MB SDRAM
2 MB Flash
10/100 M
Ethernet PHY
+5 VDC
MAC
80186 CPU
Transformer
1.5 KV isolation
UART0
Tx Rx
Customer's device
Ready
LED
RS-232 interface
Tx+ Tx- Rx-Rx+
Serial console
interface
Line
Driver
Line
Driver
UART1
GPIO Port
PIO0 - PIO3
10M
LED
100M
LED
Serial data
(Tx, Rx, RTS, CTS,
DTR, DSR, DCD)