MDS TransNET 900 Průvodce řešením problémů stáhnout pdf (Strana 2)

2 GE MDS TransNET Quick Start Guide 05-4481A01, Rev. A

the usual manner.

Figure 4. Typical Tail-End Link Arrangement

1.2.4 Extending a TransNET Network with a

Repeater

Similar to a Tail-End Link, Store-and-Forward (SAF) offers a way

to physically extend the network range, but in a simple and

economical manner. SAF works by dividing a network into a

vertical hierarchy of two or more sub-networks. Extension radios

(designated as MODE X) serve as single-radio repeaters that link

adjacent sub-networks, and move data from one sub-network to

the next one.

Invisible place holder

Figure 5. TransNET Repeater Network

1.3 Accessories

GE MDS offers an Accessories Selection Guide listing additional

items that may be used with our products. Contact your factory

representative or visit www.GEmds.com for the latest copy.

2.1 TransNET Installation

Figure 6 shows a typical Remote station arrangement. Master

stations are similar, but an omni-directional antenna is normally

used instead of a directional type, and a host computer replaces

the data terminal equipment.

Figure 6. Typical Remote Station Arrangement

The following steps provide an overview of the installation

procedure. For additional details, refer to the MDS TransNET

Reference Manual (05-2708A01).

1. Select a site that provides stable power, protection from the

weather, entrances for antenna and other cabling, and an

antenna location with an unobstructed transmission path in

the direction of the associated station(s).

2. Select and install an appropriate antenna and feedline for your

system requirements.

3. Mount the transceiver to a stable surface using the brackets

supplied with the radio (fasteners/anchors are not supplied).

4. Connect the data equipment to the transceiver’s DATA con-

nector. Use only the required pins for the application. Refer to

Figure 7.

5. Measure and install the primary power for the transceiver. It

must be within 6–30 Vdc (including transients) and be capable

of providing 7.5 watts over this voltage range. (Typical current

draw is 400 mA @13.8 Vdc; 0.9 A at 6 Vdc.) A power connec-

tor with screw-terminals is provided with each unit.

Figure 7. Interface Connector Functions

6. Set the radio’s basic configuration with a PC terminal con-

nected to the DIAG(nostics) connector via an RJ-11 to DB-9

adapter cable, MDS P/N 03-3246A01. For more information

on connecting a PC terminal and preparing it for use, refer to

the MDS TransNET Reference Manual (05-2708A01).

Three essential settings for the transceiver are:

• Mode: Master, Remote, or Extension

• Network Address: A unique number from 1 to 65000

• Data Interface Parameters: bps, data bits, parity, stop

bits

7. Perform the initial start-up of the transceiver:

a. Apply primary power.

b. Observe the transceiver LED status panel for proper indi-

cations.

In a normally operating system, you will see the following

indications within 16 seconds of start-up:

PWR lamp lit continuously

SYNC lamp lit continuously

Remote radio(s) transmitting data (TXD) and receiving

data (RXD) with the Master station.

8. Optimize the installation by checking:

• Antenna aiming

• Antenna SWR

• Data buffer setting (Modbus protocol)

• Hoptime setting

• TotalFlow™ Protocol at 9600 with Sleep Mode

• Operation at 115200 bps

• Baud rate setting

2.0 HARDWARE INSTALLATION

YNC

RXD

MDS TransNET

Master

REPEATER STATION

MDS x710B

Series Radio

ESCAPE

ACT

TIVE

STBY

ARM

ALR

X A

STBY

LARM

LINE

LIN

TXD

Null-Modem Cable

Remote

Radio

Remote

Radio

MDS TransNET

Remote

Master Station

SPREAD SPECTRUM LINK

TO OUTLYING SITE

OUTLYING

REMOTE SITE

MAS SYSTEM (LICENSED OR UNLICENSED)

LICENSE-FREE SPREAD SPECTRUM SYSTEM

RTU

MDS TransNET

Extension

MODE = X

REPEATER STATION

MDS TransNET

Remote

MODE = R

SPREAD SPECTRUM LINK

TO OUTLYING SITE

OUTLYING

REMOTE SITE

MDS TransNET

Remote

MODE = R

MDS TransNET

Remote

MODE = R

MDS TransNET

Master

MODE = M

SAF = ON

RTU

POWER SUPPLY

13.8 VDC @ 500 mA

(6–30 Vdc)

DATA TERMINAL

EQUIPMENT

MDS Transceiver

LOW-LOSS FEEDLINE

ANTENNA

SYSTEM

Antenna

Primary PowerData

(6–30 Vdc)

Diagnostic

(Communications)

(Payload)

PW R SYNC TXD RXD

1 2 3 4 5 6

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