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1620A "DewK" Thermo-hygrometer
User's Guide
7.5.3.2
62
RF (optional)
The RF wireless interface allows the instrument to receive and respond to com-
mands from a remote computer through a radio-frequency wireless link. (See
Section 8 for a list of commands.) The computer must be attached to an RS-232
or USB RF modem. See Section 5.8, Accessories, for more information. These
accessories can be purchased separately. In the case of a USB RF modem, USB
driver software supplied with the modem maps the wireless link to a virtual
COM port on the computer. Proper communication between the instrument and
a computer's RF modem requires that both be set with matched settings, as
explained below.
Figure 44 RF Settings
Figure 40: RF Settings MG_1420
Selecting RF for the PORT option in the COMM SETTING menu function
presents a window containing the RF device settings, which include ENABLE,
CHANNEL, PAN ID, INST, and MODEM. There might be a delay of several
seconds as information is retrieved from the RF transceiver. The RF port option
is only available if the wireless option has been purchased and is installed.
The unique serial number (SER NUMB) of the internal 802.15.4 wireless trans-
ceiver and the signal strength (SIGNAL) of the most recently received RF sig-
nal are displayed near the top of the window. For SIGNAL, the more negative
the value the weaker the RF signal. For reliable communication, the received
signal strength should be no weaker than -90 dB. Likewise, the signal received
by the remote modem from the instrument should be no less than -90 dB.
ENABLE, when ON, switches on the RF transceiver. When RF is enabled, the
LAN port will be disabled.
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