Campbell-scientific NL100 Network Link Interface Manuel d'utilisateur télécharger pdf (Page 33)

Appendix B. Null-Modem Cable

A null-modem cable allows communication between two similar devices. It is

sometimes called a crossover cable, because the transmit and receive lines are

crossed so that the two devices can communicate. An RS-232 null modem

cable usually also crosses other handshaking lines.

An RS-232 null-modem cable can be purchased at a local computer store. The

pin-outs for this cable are provided below.

Carrier Detect

1 ⇔ 4

Data Terminal Ready

Transmit Data

2 ⇔ 3

Receive Data

3 ⇔ 2

Transmit Data

Data Terminal Ready

4 ⇔ 1, 6

Carrier Detect, Data Set Ready

Signal Ground

5 ⇔ 5

Signal Ground

Data Set Ready

6 ⇔ 4

Data Terminal Ready

Request to Send

7 ⇔ 8

Clear to Send

8 ⇔ 7

Request to Send

Not Used 9 9 Not Used

B-1

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Campbell-scientific NL100 Network Link Interface Manuel d'utilisateur Page 33