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25

CHAPTER 6: Troubleshooting

loopback is active at the remote SHM-B Sync, the
characters pass through the 4-wire cable as well. (Do

not

turn loopback mode on at

both

SHM-B Sync units at the

same time.) If some component of the data loop is
broken, improperly installed, etc., characters will come
back garbled or not at all. So type in characters at either
end, with loopback mode active at either unit, and use a
process of elimination (when does transmission succeed
and when does it fail?) to find the point of failure.

Figure 6-1. Data flow in normal vs. loopback operation.

TD

(RS-232)

RD

RD

(RS-232)

TD

TX+

TX–

RX–

RX+

RX–

TX+

TX–

SHM #1 IN

NORMAL MODE

SHM #2 IN

NORMAL MODE

SHM #2 IN

NORMAL MODE

SHM #1 IN

LOOPBACK MODE

TD

(RS-232)

RD

RD

(RS-232)

TD

TX+

TX–

RX+

RX–

RX+

RX–

TX+

TX–

RX+

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Содержание ME801-C

Страница 1: ...n the U S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Driv...

Страница 2: ...nt in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or mo...

Страница 3: ...de ba o lavabo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe se...

Страница 4: ...contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser l...

Страница 5: ...stalling Card Units 15 4 3 Initial Testing 18 5 Operation 19 5 1 Normal Operation and LED Functions 19 5 2 The RS 232 Signals Flow Control and Synchronous Timing 20 6 Troubleshooting 24 6 1 Loopback M...

Страница 6: ...t independently generates its own clock Operation 4 wire full duplex Flow Control Hardware RTS and or DTR local only control signals are not passed across the 4 wire line see Section 5 2 transparent t...

Страница 7: ...receive status these light green for a low logic level 3 to 25 V or red for a high logic level 3 to 25 V Connectors RS 232 1 Rear mounted DB25 female Line 1 Internal 4 position screw terminal block L...

Страница 8: ...t 17 VAC CT at 700 mA ME801 C 17 VAC CT at 700 mA from rack s electrical power bus Surge Protection Internal opto isolators effective up to 20 VDC on transmit and receive lines Temperature Tolerance 3...

Страница 9: ...232 clock and control signals The SHM B Sync is designed to operate with 4 wire cable See Appendix A for optimum cable specifications and supported distances data rates The SHM B Sync is also designed...

Страница 10: ...take every reasonable precaution against damaging the board with static electricity At the very least discharge yourself by touching a fixed metal surface before handling the board if possible stand...

Страница 11: ...d RTS before it responds by raising CTS The possible settings are LONG 53 ms SHORT 7 ms or NONE Factory default is NONE but if your RS 232 device needs to see a CTS delay in order to function properly...

Страница 12: ...ard version will not have power line connection RX RX TX TX 600 1200 2400 4800 9600 19200 LONG SHORT NONE TRANSMISSION LINE CONNECTION DATA RATE SELECTION 16 VAC POWER LINE 4 WIRE 2 PAIR TWISTED PAIR...

Страница 13: ...you do 2 Feed the 4 wire twisted pair cable that will run between your SHM B Sync units through the appropriate hole in the back of the case refer to Figure 3 1 on the previous page Refer to Appendix...

Страница 14: ...to RX in the other and from TX to RX RX to TX and RX to TX as shown in Figure 4 1 below Figure 4 1 Cable wiring between SHM B Sync units 5 Wrap the nylon cable tie provided with the SHM B Sync around...

Страница 15: ...how this cable should be pinned 8 Plug the other end of the RS 232 cable into a powered down device whose serial communication you want to extend 9 Repeat steps 1 through 8 with the remote site s SHM...

Страница 16: ...B Sync to the attached device through the back of a vacant slot in the card chassis Refer to Appendix A for maximum length guidelines for the 4 wire cable 3 Take the end of the 4 wire cable and remov...

Страница 17: ...d of an RS 232 cable into the DB25 female connector on the back of the card Avoid running this cable farther than 50 ft 15 2 m Refer to Section 5 2 for information about supported RS 232 signals and a...

Страница 18: ...ached to each card Your SHM B Sync system should begin operating right away If the LEDs on the cards front panels light up do the tests described in Section 4 3 If not refer to the first item in Secti...

Страница 19: ...and the attached RS 232 devices test your system by sending data from one RS 232 device to the other and vice versa if the link is meant to be bidirectional If this works go on to Section 5 1 If it do...

Страница 20: ...status of the transmitter and recceiver circuitry respectively They will light green for a high logic level or red for a low logic level and will flicker as data is transmitted and received These LEDs...

Страница 21: ...d on whether the device is a DTE or DCE To connect a sync terminal a PC running a sync protocol or another DB25 male sync DTE serial port use a straight through pinned DB25 male to female RS 232 cable...

Страница 22: ...o Send RTS and Clear to Send CTS Be aware that some devices even if they don t technically support control signals draw power from the control signal leads Table 5 1 below shows the RS 232 pins and si...

Страница 23: ...in order to signal the attached device to expect data If the cables are correctly wired and attached the system is ready for continuous data transmission The control signals will stay in this state u...

Страница 24: ...operating The SHM B Sync cannot accept clock from the attached device it also cannot buffer signals so it s very important that the two SHM B Sync units are set to the same data rate NOTE Always keep...

Страница 25: ...ire link rather than forwarded on to the attached device Figure 6 1 on the next page shows how data flows in loopback mode vs normal operation While a unit is in loopback mode the front of the button...

Страница 26: ...ters will come back garbled or not at all So type in characters at either end with loopback mode active at either unit and use a process of elimination when does transmission succeed and when does it...

Страница 27: ...e model try moving or wiggling the wallmount transformer If it s a card model make sure the card is properly seated in its chassis 2 Broken power leads If your SHM B Sync is a standalone model open it...

Страница 28: ...r distance guidelines for the 4 wire twisted pair cable No data is being transferred in either direction 1 Make sure the RS 232 cables are securely connected at both ends 2 Is the 4 wire cable connect...

Страница 29: ...pback test see Section 6 1 If local loopback fails the RS 232 cable is probably miswired broken or defective If local loopback succeeds but remote loopback fails the 4 wire cable is probably broken or...

Страница 30: ...are standalone models these inspections will require that you carefully open their cases see Chapter 3 Data is being transferred but there are an unacceptable number of errors 1 Are any of the cables...

Страница 31: ...e cable high quality If not try swapping in a better one 5 You might be having AC power trouble Try plugging the SHM B Sync standalone unit or the card s chassis into a different outlet or a different...

Страница 32: ...rt at 724 746 5500 Before you do make a record of the history of the problem We will be able to provide more efficient and accurate assistance if you have a complete description including the nature a...

Страница 33: ...ng and Packaging If you need to transport or ship a SHM B Sync Package it carefully We recommend that you use the original container Before you ship the unit back to Black Box for repair or return con...

Страница 34: ...ws the distances and data rates attainable with this type of cable CAUTION Most types of UTP cable can be used with the SHM B Sync without having much adverse effect on its performance But because it...

Страница 35: ...TA MODULATOR DEMODULATOR J1 2 4 5 20 6 7 15 17 8 3 12V 12V RECEIVE DATA RECEIVE CLOCK LOOP CURRENT DETECT XMIT DATA XMIT CLOCK BAUD RATE SELECTION XMIT ENABLE CLOCK 12V TRANSMIT DATA INDICATOR NORMAL...

Страница 36: ...35 NOTES...

Страница 37: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved...

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