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FOM LINE DRIVER—ST AND S M

6

There are three operating modes you can choose from: network mode, master/slave mode, or point-to-

point configuration. In network mode, all of the units are configured. If you want one Line Driver

configured as a master and the others as slaves, you need to be in master/slave mode. Finally, point-to-

point configuration is a full-duplex mode where both FOM Line Drivers are configured as masters.
This chapter describes each scenario in greater detail. Read the entire chapter before deciding which

configuration is right for you.

3.1 Network Mode

In this mode, data sent to the transmitter (TX) of the RS-232 DB9, 20-mA current loop, or RS-485

terminal block is passed out to both optical transmitters (TX).
Data received from either optical receiver (RX) is passed through to the opposite optical port’s

transmitter (TX), to the receiver (RX) of the RS-232 DB9, the 20-mA current loop, or the RS-485 port.

NOTE

There is no collision detection.

Figure 3-1. All units configured in network mode.

As you look at the example above, keep these things in mind.

• In network mode, all of the devices look the same. There are no masters or slaves.

• Data flow is half-duplex only.

• All devices see all data on the network.

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

TX RX

3. Configurations

Fiber

Cabling

232/485/C. Loop

Receiving
Receiving

232/485/C. Loop

Receiving

Transmitting

232/485/C. Loop

Transmitting

Receiving

232/485/C. Loop

Receiving
Receiving

Data
Path

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Содержание ME540A-ST

Страница 1: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1998 Black Box Corporation All rights reserved ...

Страница 2: ...t 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com CUSTOMER SUPPORT INFORMATION FEBRUARY 1998 ME540A ST ME540A SM FOM Line Driver ST FOM Line Driver SM ...

Страница 3: ...una alberca etc 6 El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser refe...

Страница 4: ...tallation 9 4 1 Setup 9 4 2 RS 232 10 4 3 RS 485 10 4 4 20 mA Current Loop Point to Point 13 5 Quick Setup Guide 14 6 Troubleshooting 17 6 1 Application Problems 17 6 2 Calling Your Supplier 17 6 3 Shipping and Packaging 17 TRADEMARKS USED IN THIS MANUAL ST is a registered trademark of American Telephone and Telegraph Company All applied for and registered trademarks are the property of their resp...

Страница 5: ...ndicators 10 LEDs 232 485 20mA NETWORK MASTER SLAVE PORT B TXD PORT B RXD PORT A TXD PORT A RXD User Controls 1 Pushbutton Pressed in enables DLB Digital Loopback mode and fully extended enables NORMAL mode Link Budget 50 125µ cable 2 5 dB 62 5 125µ cable 6 dB 100 140µ cable 11 5 dB Fiber Launch Power 14 dB Receiver Sensitivity 25 dB Wavelength 820 nm Cable Requirements Use multi mode fiber cable ...

Страница 6: ...85 interface sharing a common terminal block with a switch to select the desired interface This will let you connect an RS 232 RS 485 or current loop device to a fiberoptic link There are also two sets of fiberoptic receivers and transmitters with ST or SMA connectors supporting standard fiber cable through 200 microns multimode 2 2 Speed and Distance The Line Driver runs at up to 20 Kbps on the 2...

Страница 7: ... loop or RS 485 terminal block is passed out to both optical transmitters TX Data received from either optical receiver RX is passed through to the opposite optical port s transmitter TX to the receiver RX of the RS 232 DB9 the 20 mA current loop or the RS 485 port NOTE There is no collision detection Figure 3 1 All units configured in network mode As you look at the example above keep these thing...

Страница 8: ...tion is traveling through the other slaves slaves don t see data from other slaves This keeps the slaves from having to stop working in order to translate another slave s information Figure 3 2 One unit configured as a master all others as slaves As you look at the example above keep these things in mind Data flow is half duplex only The master transmits out of Port B only Slaves transmit out of P...

Страница 9: ... the fiber connecting an RS 232 RS 485 or 20 mA current loop device to another RS 232 RS 485 or 20 mA current loop device Figure 3 3 Point to point Both units configured as masters NOTE The same interface is not required on both sides TX TERMINAL BLOCK RX TX RX RX TX RX TX TX RX RX TX TERMINAL BLOCK FIBER OPTIC CABLE DB 9 DB 9 ...

Страница 10: ...S1 Position 5 and 6 are used as a pair to bias the Line Driver s receivers and must be moved together S1 Position 3 and 4 are used as a pair to bias the Line Driver s TX pair and must be moved together In most RS 485 applications you would bias your RX S1 Position 5 and 6 ON or closed For example say you have an RS 485 network in an idle condition with all nodes in the receive mode Since the drive...

Страница 11: ...RX Data 3 RX Data 3 TX Data 7 RTS Input 7 RTS Held High 4 DTR Input 4 DTR Held High 8 CTS Output 5 Signal Ground 6 DSR Held High 8 No Connect 1 CD Held High 6 No Connect 5 Signal Ground 1 No Connect 2 Set W3 If you selected XW1A DCE Position AB will enable DTR DTR controls CTS In position BC RTS controls CTS If you selected XW1B DTE all handshake leads are ignored and W3 will have no effect It s n...

Страница 12: ...B S5 determines which circuit is tied to TB1 3 Set W4 W5 and W6 For 4 wire operation W4 and W5 are in the A B position as shipped When configured for 4 wire W6 is not used For 2 wire operation Move W4 and W5 to the B C position W6 is now used to set the time the driver will remain enabled after the transmission of the last data bit see below A 7 msec delay B 2 msec delay C 0 7 msec delay D 0 15 ms...

Страница 13: ...5 applications positions 3 and 4 should be OFF and positions 5 and 6 should be ON Note that positions 3 and 4 and positions 5 and 6 should always be moved in pairs either both open or both closed NOTE To use S1 positions 3 through 6 appropriately you should have a firm understanding of your network requirements Figure 4 1 Biased Failsafe Operation Switches RS 485 Data Flow TB1 4 TB1 1 TB1 2 TB1 3 ...

Страница 14: ...icated below for 4 wire current loop applications Position 1 Receive B positive Position 2 Receive A negative Position 3 Transmit B positive Position 4 Transmit A negative 2 Set S5 Move S5 to the Current Loop position A S5 determines which circuit is tied to TB1 3 Set S2 and S3 To configure the current loop transmitter and or receiver as active or passive set S2 and S3 as shown below S2 20 mA Curr...

Страница 15: ... 0 Open Off 1 Closed On S1 Pos 1 Mode Select 0 Network Mode 1 Master Slave Mode Pos 2 Master Slave Select 0 Master 1 Slave W3 When the unit is set to DCE XW1A Pos AB selects CTS response to DTR Pos BC selects CTS response to RTS When the unit is set to DTE XW1B this strap has no function XW2A RS 232 interface XW1B Sets the RS 232 interface for DTE XW1A Sets the RS 232 interface for DCE RS 232 inte...

Страница 16: ...re Set for the BC position 2 wire W6 When in 2 wire this is the time that the driver remains enabled after the TX of the last data bit Delays are A 7 ms B 2 ms C 0 7 ms D 0 15 ms XW2B RS 485 interface S5 set to B RS 485 RS 485 Terminal Block S1 Pos 1 Mode Select 0 Network Mode 1 Master Slave Mode Pos 2 Master Slave Select 0 Master 1 Slave Pos 3 4 Bias TX see pg 9 0 No Bias 1 Biased Pos 5 6 Bias RX...

Страница 17: ... B TX A RX A TX A RX B TX B Slave Master Network 20mA Loopback Switch RS 232 RS 485 20 mA Terminal Block S5 set to A 20mA XW2C 20 mA interface S2 and S3 S2 Pos A Active RX S2 Pos B Passive RX S3 Pos A Active TX S3 Pos B Passive TX S1 Pos 1 Mode Select 0 Network Mode 1 Master Slave Mode Pos 2 Master Slave Select 0 Master 1 Slave KEY 0 Open Off 1 Closed On ...

Страница 18: ...repair the unit It contains no user serviceable parts Contact your supplier Before you do make a record of the history of the problem Your supplier will be able to provide more efficient and accurate assistance if you have a complete description including the nature and duration of the problem when the problem occurs the components involved in the problem any particular application that when used ...

Страница 19: ...FOM LINE DRIVER ST AND SM 18 Application Diagram forms are found on pages 19 21 and 23 You may be asked to fax your diagram to the Technical Support department Use scissors to remove the page ...

Страница 20: ...19 Local Node Remote Node XW2 XW2 XW1 XW1 W3 W3 W2 W2 S5 S5 W4 W4 W5 W5 W6 W6 S2 S2 S3 S3 S1 S1 NOTE 0 Open or Off 1 Closed or On NOTE 0 Open or Off 1 Closed or On 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 TX TX TX A A B B TX RX RX RX RX ...

Страница 21: ...FOM LINE DRIVER ST AND SM 20 ...

Страница 22: ... Remote Node XW2 XW2 XW1 XW1 W3 W3 W2 W2 S5 S5 W4 W4 W5 W5 W6 W6 S2 S2 S3 S3 S1 S1 NOTE 0 Open or Off 1 Closed or On NOTE 0 Open or Off 1 Closed or On 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B RX RX RX RX TX TX TX TX ...

Страница 23: ...FOM LINE DRIVER ST AND SM 22 ...

Страница 24: ... Remote Node XW2 XW2 XW1 XW1 W3 W3 W2 W2 S5 S5 W4 W4 W5 W5 W6 W6 S2 S2 S3 S3 S1 S1 NOTE 0 Open or Off 1 Closed or On NOTE 0 Open or Off 1 Closed or On 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 TX TX TX TX RX RX RX RX B B A A ...

Страница 25: ...FOM LINE DRIVER ST AND SM 24 ...

Страница 26: ...FOM LINE DRIVER ST AND SM 25 ...

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