Quatech MPA-200/300, RS-422/485 CTS Ctsa +DSR Dcda, DTR DTR/REQA DSR Dcda +RRCLK Trxc Test Mode

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Table 16 DCE Connector Pin Definitions

Pin	Signal	Source
1	No Connect
2	+RXD	RXDA
3	+TXD	TXDA
4	+CTS	CTSA
5	+RTS	RTSA
6	+DTR	DTR/REQA
7	DGND
8	+CD	DTR/REQB
9	-TTCLK	TRXCA
10	-CD	DTR/REQB
11	-RRCLK	RTXC
12	-RTCLK	TRXCB
13	-RTS	RTSA
14	-RXD	RXDA
15	+RTCLK	TRXCB
16	-TXD	TXDA
17	+TTCLK	TRXCA
18	No Connect
19	-CTS	CTSA
20	+DSR	DCDA
21	No Connect
22	-DTR	DTR/REQA
23	-DSR	DCDA
24	+RRCLK	TRXC
25	TEST MODE	Always Zero

Quatech Inc., MPA-200/300 Manual

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Contents MPA-200/300 QUATECH, INCPage Warranty Information Page Compliances Electromagnetic Emissions Table of Contents Quatech Inc., MPA-200/300 Manual Introduction MPA-200 board drawing Hardware Installation IRQ DMA/DRQSCC General Information Accessing the registers RR0 RR1RR2 RR3WR0 WR1WR2 WR3Baud Rate Generator Programming SCC Data Encoding Methods Jumper Block Configurations J4 Interrupt ConfigurationJ5 & J6 Interrupt Level Selection IRQ3 IRQ4 IRQ5 IRQ6 IRQ7IRQ10 IRQ11 IRQ12 IRQ14 IRQ15 J10 Transmit DMA Channel SelectionJ11 Receive DMA Channel Selection J7 Line Driver Control SelectionJ8 Synca to Rlen control Synca Rlen OUTAddressing Base Address = 3F8HPage Interrupts Direct Memory Access Page Reqa Configuration Register D1 -RXSRC, Receive DMA Source D0 -TXSRC, Transmit DMA SourceCommunications Register TM ST Llen Rlen Rcken Tcken Rxden TxdenD1 -RECEIVER Enable D0 -TRANSMITTER EnableDTE / DCE Configuration DTE Configuration Rrclk Rtclk Trxca Tclk TtclkDCE Configuration DCE Clock Configuration External Connections DTR DTR/REQA DSR Dcda +RRCLK Trxc Test Mode CTS Ctsa +DSR DcdaTest Mode Null-Modem Cables Circuit AB Signal Ground Connector Notation Dgnd Circuit CC Data SET Ready DSR Connector Notation +DSR,-DSRConnector Notation +TXD,-TXD Connector Notation +RXD,-RXDConnector Notation +RTCLK,-RTCLK Connector Notation +RRCLK,-RRCLKCircuit CA Request to Send RTS Connector Notation +RTS,-RTS Circuit CB Clear to Send CTS Connector Notation +CTS,-CTSCircuit CD DTE Ready DTR Connector Notation +DTR,-DTR Circuit LL Local Loopback LL Connector Notation LlbkCircuit RL Remote Loopback RL Connector Notation Rlbk Circuit TM Test Mode TM Connector Notation Test Mode Specifications MPA-200/300 Version March