Lantronix xPico xPico - Integration Guide - Page 24

xPico Signal, DCE Connector, xPico, Signal, logic, Description, RS485, Serial Port Example

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Figure 2-8 Serial Port Example 2: Functional Description Table 2-9 RS232 Connections (Serial Transceiver Required) xPico Signal Signal Description (Logic) RXDx Data In TXDx Data Out RTSx H/W Flow Control Output CTSx H/W Flow Control Input CPx Modem Control Input CPy Modem Control Output DCE Connector DB9 DB25 Signal 2 3 3 2 7 4 8 5 1 8 4 20 RXDx TXDx RTSx CTSx DCDx DTRx DTE Connector DB9 DB25 3 2 2 3 8 5 7 4 4 20 1 8 Signal TXDx RXDx CTSx RTSx DTRx DCDx xPico Signal (logic) TXDx TXDx RXDx RXDx RTSx CPx CPy Table 2-10 RS422/485 Connections (Serial Transceiver Required) Description RS485 Signal DB25 4 DB25 2 DB9 4 Wire Wire wire DB9 2 wire Data Out TX+485 14 14 7 7 Data Out TX-485 15 15 3 3 Data In RX+485 21 14 2 7 Data In RX-485 22 15 8 3 TX Enable RS485 Select RS485 2-wire Note: The IO pins for xPico Wi-Fi are set to floating input on power up until configured by unit firmware. An external 100K ohm pull-up may be required on the serial transmit signal to prevent downstream UART devices from detecting false characters on initial power up. xPico® Embedded Device Server Integration Guide 24

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2: Functional Description
Figure 2-8
Serial Port Example
Table 2-9
RS232 Connections (Serial Transceiver Required)
xPico Signal
DCE Connector
DTE Connector
Signal
(Logic)
Description
DB9
DB25
Signal
DB9
DB25
Signal
RXDx
Data In
2
3
RXDx
3
2
TXDx
TXDx
Data Out
3
2
TXDx
2
3
RXDx
RTSx
H/W Flow Control Output
7
4
RTSx
8
5
CTSx
CTSx
H/W Flow Control Input
8
5
CTSx
7
4
RTSx
CPx
Modem Control Input
1
8
DCDx
4
20
DTRx
CPy
Modem Control Output
4
20
DTRx
1
8
DCDx
Table 2-10
RS422/485 Connections (Serial Transceiver Required)
xPico
Signal
(logic)
Description
RS485
Signal
DB25
4
Wire
DB25
2
Wire
DB9
4
wire
DB9
2
wire
TXDx
Data Out
TX+485
14
14
7
7
TXDx
Data Out
TX-485
15
15
3
3
RXDx
Data In
RX+485
21
14
2
7
RXDx
Data In
RX-485
22
15
8
3
RTSx
TX Enable
CPx
RS485 Select
CPy
RS485 2-wire
Note:
The IO pins for xPico Wi-Fi are set to floating input on power up until
configured by unit firmware.
An external 100K ohm pull-up may be required on
the serial transmit signal to prevent downstream UART devices from detecting
false characters on initial power up.
xPico® Embedded Device Server Integration Guide
24