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Connect Tech Xtreme/104 Plus, PCI-104 and PCI/104 Express Family User Manual

Revision 0.08

Table 2: I/O Signal Assignments for RS-232/422/485 Models (See Figure 1 for Port Numbering)

Header

Port No.

(4 port

models)

Header

Port No.

(8 port

models)

Pin No.

RS-232

Direction

RS-

422/485

Direction

1 or 2

DCD

Input

RxD+

Input

DSR

Input

CTS-

Input

RxD

Input

RxD-

Input

RTS

Output

RTS+

Output

TxD

Output

TxD+

Output

CTS

Input

CTS+

Input

DTR

Output

TxD-

Output

Input

RTS-

Output

Signal Ground

Signal Reference

N/C

No Connection

N/C

No Connection

3 or 4

DCD

Input

RxD+

Input

DSR

Input

CTS-

Input

RxD

Input

RxD-

Input

RTS

Output

RTS+

Output

TxD

Output

TxD+

Output

CTS

Input

CTS+

Input

DTR

Output

TxD-

Output

Input

RTS-

Output

Signal Ground

Signal Reference

N/C

No Connection

N/C

No Connection

5 or 6

DCD

Input

RxD+

Input

DSR

Input

CTS-

Input

RxD

Input

RxD-

Input

RTS

Output

RTS+

Output

TxD

Output

TxD+

Output

CTS

Input

CTS+

Input

DTR

Output

TxD-

Output

Input

RTS-

Output

Signal Ground

Signal Reference

N/C

No Connection

N/C

No Connection

7 or 8

DCD

Input

RxD+

Input

DSR

Input

CTS-

Input

RxD

Input

RxD-

Input

RTS

Output

RTS+

Output

TxD

Output

TxD+

Output

CTS

Input

CTS+

Input

DTR

Output

TxD-

Output

Input

RTS-

Output

Signal Ground

Signal Reference

N/C

No Connection

N/C

No Connection

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 31 32 33

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