Figure 2-16 Evaluation Board Schematic, Sheet 2 Of 6 - Lantronix xPico 110 Integration Manual

Install Jumpe rs to conne ct to DB9 Se rial Port 1
JP17
2 1
TXDA
p2,4 TXD1
4 3
RXDA
p2,4 RXD1
6 5 RTSA
p2 RTS1
8 7
DTRA
p2 CP3
10 9 CTSA
p2 CTS1
12 11
DCDA
p2 CP4
HEADER 6X2
RS232_485_SEL
JP11
1
Le ave ope n for RS232 mode
2
Install for RS485/RS422
JP12
1 2WIRE_4WIRE_SEL
Le ave ope n for RS232 or 4 wire mode
2
Install for 2-wire mode
3V3
RS485 Mode TX conne ctor
Inve rte d from SP336 so swap
TX and RTS whe n in RS485 mode .
U16
RTSA 2 4 SERIAL_TX1
PI74ST1G125
RS232_485_SEL
This signal is low in RS485 mode
3V3
U17
TXDA 2 4
PI74ST1G125
RS485_RS232_SEL
This signal is low in RS232 mode
Note: R10, R11, R19, R46, and R56 could be 0 ohm resistors, ferrites, or ceramic capacitors for EMC purpose, recommended
0.001 uF.
xPico® 110 Embedded Device Server Integration Guide

Figure 2-16 Evaluation Board Schematic, Sheet 2 of 6

3V3
C11
4.7uF
3V3
3V3
R16
10k U4
This signal is low in RS232 mode
1
4
RS485_RS232_SEL
2
2WIRE_4WIRE_SEL
3V3
SERIAL_RTS1
NC7SZ02
SERIAL_TX1
DTRA
C17
0.1uF
RXDA
CTSA
DCDA
3V3
3V3
R54
10k
U18
TXDA 2 4 SERIAL_RTS1
PI74ST1G125
RS232_485_SEL
This signal is low in RS485 mode
3V3
U19
RTSA 2 4
PI74ST1G125
RS485_RS232_SEL
This signal is low in RS232 mode
3V3
3V3
C12
U3
0.1uF
9
C1+
3V3
C14
12
0.1uF, 50V
C1-
11
C2+
R17
10k C15
13
0.1uF, 50V
C2- SLEW
24
Mode_0
2
Mode_1
23
Mode_2
26
T1_in_TXA T1_out_TXA+
27
T2_in_TXENA T2_out_TXA-
28
T3_in_TXB T3_out_TXB+
1
T4_in_TXENB T4_out_TXB-
19
R1_out_RXA R1_in_RXA+
20
R2_out R2_in_RXA-
21
R3_out_RXB R3_in_RXB+
22
R4_out R4_in_RXB-
SP336E
3V3
R55 MO DE (MO , M1, M2)
10k
Mode 001 = RS232 (De fault)
Mode 101 = 4 Wire (Full duple x)
Mode 100 = 2 Wire (Half Duple x)
3V3 3V3 3V3 3V3
C70 C71 C72 C73
0.1uF 0.1uF 0.1uF 0.1uF
2: Functional Description
RS232/RS485/RS422
10
C13 0.1uF, 50V
V+
14
C16 0.1uF, 50V
V-
3V3
25
R18 10k
DTR1_232 L1
6 RTS1_232/TX+485 CTS1_232/RX-485
L2
7
TX1_232/TX-485 TX1_232/TX-485 L3
4
DTR1_232 RTS1_232/TX+485
L4
3 RX1_232/RX+485
L5
L6
15 RX1_232/RX+485 DCD1_232
L7
16
CTS1_232/RX-485
17
DCD1_232
18
Serial Driver 1
SERIAL PORT 1
R19 DNP_0
5
9
4
BLM15BB220SN1D
8
BLM15BB220SN1D
3
BLM15BB220SN1D J3
7
BLM15BB220SN1D DE9-MALE
2
BLM15BB220SN1D
6
DNP
1
BLM15BB220SN1D
20