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CHAPTER 6: Operation (Port Selection)

21

the Sharer will end that slave’s session and select a new active port.

When the Sharer times out a slave, it continues to monitor that slave’s

RTS signal. It will deny that slave any further line access (that is, it will
ignore that slave’s port each time it chooses a new active port) until the
slave’s RTS goes low and then high again (a good sign that the slave
device has been reset, fixed, or replaced).

NOTE

Some asynchronous dumb terminals continuously assert RTS from the time they

are powered ON until they are powered OFF. This behavior can cause an

RS-232 Data Sharer to time out such a terminal and never switch back to it. If

you must put such a terminal on your system, call your supplier. They might

be able to provide you with equipment better suited to your application.

4.

Once the active slave device drops RTS, the RS-232 Data Sharer either
(a) locks onto the requesting port with the highest priority (this is the
case for 2-port Sharers and for 4- and 8-port Sharers with jumper W4 in
the B–C position), or (b) begins polling at the next port in sequence and
locks onto the first device it detects with RTS asserted (this is the case for
4- and 8-port Sharers with jumper W4 in the A–B position).

Содержание TL553A-R3

Страница 1: ...ail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com JULY 2000 TL553A R3 TL553AE R3 TL554A R3 TL554AE R3 TL601A R2 TL601AE R2 RS 232 Data Sharers PWR MASTER PORT CTS CD RXD RTS DISABLED RTS ENABLED RTS STATUS A B C D E F G H RS 232 DATA SHARER 8 MASTER PORT CTS CD RXD RTS DISABLED RTS ENABLED PWR RTS STATUS A B RS 232 DATA SHARER...

Страница 2: ... is operated in a commercial environment Operation of this equipment 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 modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment Th...

Страница 3: ...ente 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 referido a personal de servicio calificado 9 El aparato eléctric...

Страница 4: ...icamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servi...

Страница 5: ...S MANUAL IBM is a registered trademark of International Business Machines Corporation Molex is a registered trademark of Molex Incorporated Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners ...

Страница 6: ...gle Switches 11 4 Jumper Selectable Options 12 4 1 Jumper W1 Tying Signal Ground to Frame Ground 13 4 2 Jumper W2 RTS Delay 14 4 3 Jumper W3 RXD Broadcast or Gated Mode 14 4 4 Jumper W4 Priority Selection 4 and 8 Port Models Only 15 4 5 Timeout Jumpers 15 5 Installation 18 6 Operation Port Selection 20 7 Troubleshooting 22 7 1 Calling Your Supplier 22 7 2 Shipping and Packaging 22 Appendix Pin Des...

Страница 7: ...D RS 232 Data Sharer 4 8 LEDs Power RTS A through RTS D Master Port CD CTS and RXD RS 232 Data Sharer 8 12 LEDs Power RTS A through RTS H Master Port CD CTS and RXD Connectors RS 232 Data Sharer 2 3 DB25 female data ports RS 232 Data Sharer 4 5 DB25 female data ports RS 232 Data Sharer 8 9 DB25 female data ports Pins Supported DB25 pins 1 through 10 15 17 20 22 Power Data Sharers TL553A R3 TL554A ...

Страница 8: ... 4 95 000 hours RS 232 Data Sharer 8 65 000 hours Enclosure Steel Size RS 232 Data Sharer 2 2 5 H x 8 1 W x 11 3 D 6 4 x 20 6 x 28 7 cm RS 232 Data Sharer 4 RS 232 Data Sharer 8 2 9 H x 12 5 W x 11 1 D 7 4 x 31 8 x 28 2 cm Weight RS 232 Data Sharer 2 2 4 lb 1 1 kg RS 232 Data Sharer 4 5 0 lb 2 3 kg RS 232 Data Sharer 8 5 5 lb 2 5 kg ...

Страница 9: ... according to ports letter designations The port represented by the letter closest to the start of the alphabet is given access In round robin priority access to the shared line is strictly sequential Ports receive access in alphabetical order Front panel switches for enabling and disabling the RTS Request to Send signal on each input port With this feature you can isolate faulty units or perform ...

Страница 10: ...ller is streaming and deny it access to the line see Section 4 5 Suggested jumper settings for a Sharer in this type of application Jumper W2 in A B position 0 ms RTS delay Jumper W3 in A B position RXD Broadcast Mode Jumper W4 4 and 8 Port Sharers only in A B position sequential polling Timeout period jumpers in C position timeout disabled settings of timeout signal jumpers irrelevant The RS 232 ...

Страница 11: ...s streaming and deny it access to the line If you want any PCs or terminals that can t toggle RTS to share an RS 232 line call your supplier See Section 4 5 and step 3 in Chapter 6 Suggested jumper settings for a Sharer in this type of application Jumper W2 in B C position 25 ms RTS delay Jumper W3 in B C position RXD Gated Mode Jumper W4 4 and 8 Port Sharers only in B C position hardware prioriti...

Страница 12: ...D CTS and RXD These LEDs indicate when a device attached to the Master Port has asserted CD Carrier Detect CTS Clear to Send or RXD Received Data signals 3 2 The RTS Toggle Switches You can use these switches to enable or disable the Sharer s detecting an RTS signal on any of the slave ports Disabling a port s RTS detection will prevent that port s device from accessing the modem or CPU This featu...

Страница 13: ...2 Data Sharer 4 or RS 232 Data Sharer 8 4 Jumper Selectable Options R1 A B C A B B C RTS DELAY A B C RXD MODE 0 msec 25 msec W2 W1 A B B C Broadcast Gated W3 PORT A PORT B MASTER PORT A B C A B TXD Only B C RXD TXD TIMEOUT MODE W7 A B C W6 A B C W4 32 sec 10 sec Timeout Disabled A B C W5 32 sec 10 sec Timeout Disabled Figure 4 1 Jumper locations on the PC board of the RS 232 Data Sharer 2 ...

Страница 14: ... ground circulating currents are limited to acceptable levels MASTER PORT R1 W1 PORT D PORT C PORT B PORT A PORT H PORT G PORT F PORT E 8 PORT MODEL ONLY C B A W3 A B C W2 A B POLLED B C PRIORITIZED PRIORITY SELECTION 4 PORT AND 8 PORT MODELS ONLY A B C W4 A B C W14 A B C W13 A B C W15 A B C W16 A B C W18 A B C W17 A B C W19 A B C W20 C B A W10 C B A W9 C B A W6 C B A W5 C B A W12 C B A W11 C B A ...

Страница 15: ...tion RXD Broadcast Mode factory default setting Any data received on the RXD pin of the master port is broadcast out of the RXD pin of each slave port W3 in B C position RXD Gated Mode Only the slave port that is currently enabled the port that has RTS asserted will output data on its RXD pin All other slave ports will be forced to a marking state NOTE You must be operating in full duplex to use G...

Страница 16: ... sequentially from there Ports B C etc down to the lowest priority port Port D on 4 port models or Port H on 8 port models The Sharer will gate through to the master port the highest priority slave port that it detects having RTS asserted true 4 5 Timeout Jumpers Sometimes an RS 232 device or component malfunctions and begins to continuously assert the RTS Request to Send signal This condition cal...

Страница 17: ... period jumper in A position 32 seconds Timeout period jumper in B position 10 seconds Timeout period jumper in C position No timeout timeout disabled for corresponding port factory default setting The second group the timeout signal jumpers can also be set independently for each port 2 port units W6 Port A and W7 Port B 4 port units W13 Port A W14 Port B W15 Port C and W16 Port D 8 port units W13...

Страница 18: ...ta The Sharer will reset the timer if the slave drops RTS or resumes transmitting before the timeout expires Timeout signal jumper in B C position TXD and RXD factory default setting The Sharer will start the timeout timer when the slave on the corresponding port either a is granted access and does not transmit or receive anything but continues to assert RTS or b keeps asserting RTS after it stops...

Страница 19: ...s 2 port units W4 and W5 4 port units W5 through W8 8 port units W5 through W12 A position 32 second timeout period B position 10 second timeout period C position Timeout disabled Timeout signal jumpers 2 port units W6 and W7 4 port units W13 through W16 8 port units W13 through W20 A B position TXD only B C position RXD and TXD 4 and 8 port models only Jumper W4 in A B position sequential polling...

Страница 20: ... Port A than Port B On the 4 and 8 port models when jumper W4 is set to the B C position highest priority is given to Port A then Port B then Port C and so on in that order 3 Connect the modem CPU or other shared RS 232 device to the Sharer s Master Port The master port is configured as DTE normally requiring straight through cabling to your DCE device 4 Plug in the Sharer s power supply 5 If you ...

Страница 21: ...n its master port immediately otherwise it waits for 25 ms then asserts RTS The Clear to Send CTS and Receive Data RXD signals are gated back to the active port and the Sharer is receptive to the Transmit Data TXD signal NOTE If Broadcast Mode is enabled jumper W3 set to the A B position the RXD signal will be forwarded to all slave ports CTS will remain high until the active slave drops RTS or th...

Страница 22: ...they are powered ON until they are powered OFF This behavior can cause an RS 232 Data Sharer to time out such a terminal and never switch back to it If you must put such a terminal on your system call your supplier They might be able to provide you with equipment better suited to your application 4 Once the active slave device drops RTS the RS 232 Data Sharer either a locks onto the requesting por...

Страница 23: ...te 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 appears to create the problem or make it worse 7 2 Shipping and Packaging If you need to transport or ship your RS 232 Data Sharer Package it carefully We recommend that you use the original container If you are shipping the Sharer...

Страница 24: ...iority 6 DSR Input Output Master broadcasts to all slaves simultaneously 7 Signal Gnd Hardwired connected to all ports 8 CD Input Output Master broadcasts to all slaves simultaneously 9 Positive Signal All Pin 9s internally interconnected passed through no power is supplied on this pin from DCE device 10 Negative Signal All Pin 10s internally interconnected passed through no power is supplied on t...

Страница 25: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2000 Black Box Corporation All rights reserved ...

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