Quatech RS-422/485, MPA-200/300 user manual External Connections

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11 EXTERNAL CONNECTIONS

When configured as a DTE, the MPA-200 uses a D-25 short body male connector (labeled CN2). When configured as a DCE, the MPA-200 uses a D-25 long body female connector (labeled CN1). Table 15 and Table 16 describe the pin out definitions for both connectors and Figure 6 and Figure 7 illustrate the pin-outs for each of the connectors..

Table 15 DTE Connector Pin Definitions

Pin	Signal	SCC Pin
1	CGND
2	+TXD	TXDA
3	+RXD	RXDA
4	+RTS	RTSA
5	+CTS	CTSA
6	+DSR	DCDB
7	DGND
8	+CD	DCDA
9	-RRCLK	RTXC
10	-CD	DCDA
11	-TTCLK	TRXCA
12	-RTCLK	TRXCB
13	-CTS	CTSA
14	-TXD	TXDA
15	+RTCLK	TRXCB
16	-RXD	RXDA
17	+RRCLK	TRXC
18	LLBK	COMM REG D5
19	-RTS	RTSA
20	+DTR	DTR/REQA
21	RLBK	COMM REG D4
22	-DSR	DCDB
23	-DTR	DTR/REQA
24	+TTCLK	TRXCA
25	TEST MODE	COMM REG D7

29	Quatech Inc., MPA-200/300 Manual

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Contents QUATECH, INC MPA-200/300Page Warranty Information Page Compliances Electromagnetic Emissions Table of Contents Quatech Inc., MPA-200/300 Manual Introduction MPA-200 board drawing IRQ DMA/DRQ Hardware InstallationSCC General Information Accessing the registers RR3 RR0RR1 RR2WR3 WR0WR1 WR2Baud Rate Generator Programming SCC Data Encoding Methods IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 Jumper Block ConfigurationsJ4 Interrupt Configuration J5 & J6 Interrupt Level SelectionJ10 Transmit DMA Channel Selection IRQ10 IRQ11 IRQ12 IRQ14 IRQ15J7 Line Driver Control Selection J11 Receive DMA Channel SelectionSynca Rlen OUT J8 Synca to Rlen controlBase Address = 3F8H AddressingPage Interrupts Direct Memory Access Page Reqa Configuration Register D0 -TXSRC, Transmit DMA Source D1 -RXSRC, Receive DMA SourceTM ST Llen Rlen Rcken Tcken Rxden Txden Communications RegisterD0 -TRANSMITTER Enable D1 -RECEIVER EnableDTE / DCE Configuration Rrclk Rtclk Trxca Tclk Ttclk DTE ConfigurationDCE Configuration DCE Clock Configuration External Connections CTS Ctsa +DSR Dcda DTR DTR/REQA DSR Dcda +RRCLK Trxc Test ModeTest Mode Null-Modem Cables Connector Notation +RXD,-RXD Circuit AB Signal Ground Connector Notation DgndCircuit CC Data SET Ready DSR Connector Notation +DSR,-DSR Connector Notation +TXD,-TXDCircuit CB Clear to Send CTS Connector Notation +CTS,-CTS Connector Notation +RTCLK,-RTCLKConnector Notation +RRCLK,-RRCLK Circuit CA Request to Send RTS Connector Notation +RTS,-RTSCircuit RL Remote Loopback RL Connector Notation Rlbk Circuit CD DTE Ready DTR Connector Notation +DTR,-DTRCircuit LL Local Loopback LL Connector Notation Llbk Circuit TM Test Mode TM Connector Notation Test Mode Specifications MPA-200/300 Version March