19
ROM-DB3900 User Manual
Chapter 2
H
/W Installation
Table 2.34: COM_SEL0/1/2/3 (UART0/1/2/3 function selection
Pin
Signal
Pin
Signal
1
SER2_RX
2
RXD485_A
3
SER2_RX
4
RXD422_A
5
SER2_RX
6
RXD232_A
7
-
8
COM2_RXD
9
NDCD#TXD485-
10
NRXD
11
TXD485-_A
12
_A
13
COM2_TXD
14
-
15
NTXD2
16
NDTR#2_RXD485-
17
_A
18
RSD485-_A
Table 2.35: (UART1, 2wires)
Pin
Signal
Pin
Signal
1
TXD485-
2
-
3
COM1_RX
4
RTS
5
COM1_TX
6
CTS
7
RXD485-
8
-
9
GND
10
-
