Fluke 1521 Manuel d'utilisateur télécharger pdf (Page 41)

8 Communications Interface

Remote communications allows an external device, such as a computer, to com

municate with the 1521 to obtain measurement data and control its operation.

Communication is accomplished with various commands issued to the 1521

through the RS-232 serial port.

8.1 RS-232 Connection

The three-conductor jack for the serial port is located on the top of the 1521

near the probe connector. One serial cable is included with the 1521. Additional

or longer cables, of three meters or less, can be constructed by following the

wiring diagram shown in Figure 8. Note: The TxD line on one side connects

to the RxD line on the other and vice-versa. To reduce the possibility of elec

trical interference, the serial cable should be shielded with low resistance be

tween the connector and the shield. It should not be much longer than is

necessary. The protocol for serial communications is 8 data bits, 1 stop bit, and

no parity. Use no flow control. The baud rate is fixed at 2400, the linefeed to

8 Communications Interface

RS-232 Connection

RxD

TxD

GND

RxD

TxD

GND

Figure 8 RS-232 Wiring

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Fluke 1521 Manuel d'utilisateur Page 41