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MDS 05-3305A01, Rev. D MDS 4710/9710 I/O Guide 3

Point-to-Point System

Where permitted, the transceiver can also be used in a point-to-point

system.

A point-to-point system consists of just two radios—one

serving as a master and the other as a remote—as shown in Figure 3. It

provides a simplex or half-duplex communication link for the transfer

of data between two locations.

Invisible place holder

Figure 3. Typical Point-to-Point Link

Continuously-Keyed versus Switched-Carrier Operation

Continuously-Keyed

operation means the master station transmitter is

always keyed and an RF carrier is always present, even when there is no

data to send. The master station is always simultaneously transmitting

and continuously listening. Use different frequencies to transmit and

receive. This is the method used in many MAS systems, as is shown in

the typical system in Figure 2. This is network arrangement useful for

high-speed polling applications.

NOTE:

MDS 4710/9710 remotes do not support full-duplex operation.

Switched-Carrier

operation is a half-duplex mode of operation where

the master station transmitter is keyed to send data and unkeyed to

receive.

Single-Frequency (Simplex) Operation

Single-frequency operation (also known as simplex) is a special case of

switched-carrier operation. Single frequency operation is automatically

selected whenever the transmit and receive frequencies are set to the

same value. When used, single frequency operation increases data

turn-around times.

1.3 Model Number Codes

The radio model number is printed on the end of the radio enclosure and

provided through the software command

MODEL (

Page 25

)

. It provides

key information about how the radio was configured when it was

shipped from the factory. This number is subject to many variations

depending on what options are installed and where (country) the product

REMOTE

MASTER

HOST

COMPUTER

RTU

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 57 58

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