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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

RXD1

TXD1

Data Out

TXD1

RXD1

RTS1

H/W Flow Control Output

RTS1

CTS1

H/W Flow Control Input

CTS1

RTS1

CPx

Modem Control Input

DCD

DTR

CPy

Modem Control Output

DTR

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

DB25

Wire

DB25

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

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 32 33

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