Campbell-scientific RF300-Series DRL VHF/UHF Radio Transceivers Instrukcja Użytkownika Pobierz pdf (Strona 20)

SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS

3-2

TABLE 3-1. A Sample of Station ID Numbers

and the Corresponding Switch Settings

Station Switch Settings

ID 1234

56789

0 0000 0000X

10 0101 0000X

20 0010 1000X

30 0111 1000X

40 0001 0100X

50 0100 1100X

60 0011 1100X

70 0110 0010X

80 0000 1010X

90 0101 1010X

100 0010 0110X

110 0111 0110X

120 0001 1110X

130 0100 0001X

* Station ID 255 is reserved for

phone-to-RF base stations.

The RF95A is shipped with the switch set for

the RF95A-ME state and station ID of 1.

Further information on the RF95A compatibility

with older Campbell Scientific equipment can be

found in Appendix F “Equipment Compatibility.”

3.1.3 SETTING STATION ID

Each RF95A, including the one in the RF base

station, must have a unique Station ID. The

station ID is similar to a phone number. This

allows one base station to communicate with

any one particular field station.

The Station ID can be any number from 1 to

255. The Station ID is set with the switch inside

the RF95A. The first eight dip switches are

used to set the Station ID. Table 3-1 shows the

switch settings for several Station ID numbers.

Appendix A shows all possible Station ID

numbers. The dip switches can either be open,

represented by 1, or closed, represented by 0;

X in Table 3-1 refers to "don't care." The ninth

dip switch is set according to the desired RF95A

state, see Section 3.1.2 "RF95A States." All

RF95s are shipped with a Station ID of 1 and

are set in the RF95A-ME state. RF95s inside

the RF base station ship with a station ID of 254

and RF95A-ME state.

FIGURE 3-2. Setting the Station ID

3.1.4 THE CARRIER DETECT LIGHT

The Carrier Detect light on the front panel of the

RF95A has several purposes. The primary

function of the light is to indicate when data is

being received or transmitted. The light will stay

on when a network frequency originating from

another RF95A is detected. If a signal is

detected which isn't intended for that station, the

light will shut off after about two-tenths of a

second.

The Carrier Detect light can also be used to

check the RAM (Random Access Memory) and

ROM (Read Only Memory) of the RF95A. With

the radio disconnected and the datalogger in

the LOG (*0) Mode, connect the datalogger to

the RF95A Serial I/O Port with a 9-pin ribbon

cable. The sequence of the light flashing after

connection indicates the RAM and ROM status.

Both the RAM and ROM are good if the light

goes on for one second, off for one second, and

then back on for one second. The RAM is

faulty if the light is on for one half second and

off for one half second, continuously. The ROM

is faulty if the light goes on for one second, off

for one half second, on for one half second, and

then off for one half second, continuously.

3.1.5 DATA TRANSFER RATE

The data transfer rate is the time it takes to get

data from the datalogger to the computer. In

general, data can be transferred at a rate of

about 30 data points/second (60 bytes/second)

without a repeater. If a repeater is used, an

approximate data transfer rate is 22 data

points/second.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 63 64

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