Lantronix MatchPort b/g Pro, Руководство по интеграции

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2: Description and Specifications
MatchPort b/g Pro Integration Guide 13
Serial Input/Output
The unit has two
RS232 compatible
serial ports supporting data rates up to 230 Kbps.
They include dedicated RTS and CTS hardware flow control signals. Configurable Pins
can be configured to function as DTR and/or DCD.
Serial Port 1 can also be configured for RS422/485. RTS is used as TX enable.
Configurable Pins can be configured to function as RS232/RS485 driver selection control
and/or half/full duplex driver selection.
The serial module interface employs 3.3V CMOS logic levels, requiring external level
shifters for full RS232/485/422 compliance The MatchPort Demo Board includes these
line drivers and DTE style DB9 connectors.
Table 2-1. RS232 Connections
MatchPort b/g Pro DCE Connector DTE Connector
Signal
(Logic) Description
DB9 DB25 Signal DB9 DB25 Signal
RXD1 Data In 2 3 RXD1 3 2 TXD1
TXD1 Data Out 3 2 TXD1 2 3 RXD1
RTS1 H/W Flow Control Output 7 4 RTS1 8 5 CTS1
CTS1 H/W Flow Control Input 8 5 CTS1 7 4 RTS1
CPx Modem Control Input 1 8 DCD 4 20 DTR
CPy Modem Control Output 4 20 DTR 1 8 DCD
Note: CPx and CPy are any of the available CPs.
Table 2-2. JP6 RS422/485 Connections on Demo board
MatchPort
b/g Pro
Signal
(logic) Description
RS485
Signal JP6
Pin DB25
4
Wire DB25
2
Wire DB9
4 wire DB9
2 wire
TXD1 Data Out
TX+485 4 14 14 7 7
TXD1 Data Out
TX-485 3 15 15 3 3
RXD1 Data In
RX+485 2 21 14 2 7
RXD1 Data In
RX-485 1 22 15 8 3
RTS1 TX Enable
CP3 RS485 Select
CP4 RS485 2-wire
Sample Layouts for RS485 Connectivity
Figure 2-8. Combined RS232/422 Transceiver