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RS-232 Data Sharers

1. 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 enne cineca Data Sharers TL553A R3 TL554A R3 and TL601A R2 From wallmount power supply PS154 Input 115 VAC 60 Hz at 100 mA Output 17 VAC CT at 700 mA Data Sharers TL553AE R3 TL554AE R3 and TL601AE R2 From in line power supply PS154E Input 230 VAC 50 Hz at 50 mA Output 17 VAC CT at 750 mA Operating Temperature 32 to 140 F 0 to 60 C Storage Temperature 4 to 158 F 20 to 70 C Humidity ussssss 0 to 95 relative humidity noncondensing CHAPTER 1 Specifications Mean Time Between Failures ground benign environment RS 232 Data Sharer 2 180 000 hours RS 232 Data Sharer 4 95 000 hours RS 232 Data Sharer 8 65 000 hours 11 3 D RS 232 Data Sharer 2 2 5 8 1 W x 20 6 x 28 7 cm 6 4 RS 232 Data Sharer 4 RS 232 Data Sharer 8 2 9 12 5 W x 11 1 D x 81 8 x 28 2 cm 7 4 61101 RS 232 Data Sharer 2 2 4 Ib 1 1 kg RS 232 Data Sharer 4 5 0 Ib 2 3 kg RS 232 Data Sharer 8 5 5 lb 2 5 kg 2 Introduction The RS 232 Data Sharer allows multiple devices such as mainframe controllers terminals etc to share a single RS
2. BLACK BOX JULY 2000 TL553A R3 TL553AE R3 TL554A R3 TL554AE R3 TL601A R2 TL601AE R2 RS 232 Data Sharers CUSTOMER Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FCC AND IC STATEMENTS FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio communication It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment 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 equi
3. 32 seconds 10 seconds or disabled and RTS timeout signal RXD and TXD or TXD only In all applications the Sharer shares a single RS 232 line among multiple devices Beyond that applications will vary depending on the function of the device connected to the Sharer s master port Typical synchronous and asynchronous applications are described on the following pages CHAPTER 2 Introduction 2 1 Typical Synchronous Application In this kind of application the devices sharing the line the slave devices are usually controllers at a remote site The shared line runs from the RS 232 Data Sharer to a modem the master device that is ultimately linked to a host computer The controllers must be configured for multipoint modems with the Request to Send RTS signal switched RTS has to be switched because if a controller keeps RTS high the Sharer will think the controller is streaming and deny it access to the line see Section 4 5 Suggested jumper settings for a Sharer in this type of application y Jumper W2 in A B position 0 ms RTS delay y Jumper W3 in A B position RXD Broadcast Mode y Jumper W4 4 and 8 Port Sharers only in A B position sequential polling y Timeout period jumpers in C position timeout disabled settings of timeout signal jumpers irrelevant The RS 232 Data Sharer is transparent to communications protocol SDLC BSC etc data encoding technique NRZ NRZI etc and addressing IBM Con
4. 232 line You can use this device to let multiple terminals or controllers share a single modem or multiplexor port so you spend less money on telephone line lease charges and modem costs The RS 232 Data Sharer is available in three models TL601A R2 and TL601AE R2 RS 232 Data Sharer 2 Port e TL553A R3 and TL553AE R3 RS 232 Data Sharer 4 Port e TL554A R3 and TL554AE R3 RS 232 Data Sharer 8 Port Each of the RS 232 Data Sharers supports the following features Transparency to data Transparency to data rates up to 115 2 Kbps Synchronous and asynchronous data transmission e Either hardware priority or round robin priority for selection of terminal ports In hardware priority requests for access to the shared line are prioritized 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 process of elimination diagnostics This is because when the RTS signal is disabled on a port that port can t contend for access Jumper selectable options RTS delay 0 or 25 ms RXD operation gated or broadcast mode hardware prioritized vs round robin port selection RTS timeout period
5. aci n Todo otro servicio deber ser referido a personal de servicio calificado El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor NOM STATEMENT 11 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato 12 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 13 Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los 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 localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado
6. an RS 232 Data Sharer providing four PCs with access to an async host 3 The Front Panel models of the RS 232 Data Sharer have similar front panels The only difference is the number of RTS LEDs and toggle switches depending on the model there are two four or eight RTS indicators and a matching number of switches This chapter describes each of the front panel indi cators and switches 3 1 The LEDs PWR If this LED is lit the Sharer is ON If not either the Sharer is OFF or it s not getting any power RTS These LEDs indicate the status of the RTS signal for each port There is one RTS LED for each terminal slave port When the Request to Send signal is raised on any of the terminal ports the corresponding LED will light up Master Port CD 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 feature is useful if you want to isolate a slave device especially if the device is malfunctioning RTS Enabled A slave port s RTS detection is enabled when the port s switch is in the down position the factory default setting The port s RTS LED will light when the por
7. debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n 18 Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido danado u B Objectos han ca do o l quido ha sido derramado dentro del aparato o C Elaparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempeno o E Elaparato ha sido tirado o su cubierta ha sido danada RS 232 DATA SHARERS TRADEMARKS USED IN THIS 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 TABLE OF CONTENTS Contents Chapter Page 15 Speciicalons oia 6 2 0100 iii me Puce 8 2 1 Typical Synchronous Application eee 9 2 2 Typical Asynchronous Application eee 11 5 The Front Panel AAA 11 3 1 The LEDS pni it 11 3 2 The RTS Toggle Switches t 11 4 Jumper Selectable Options eee em enne 12 4 1 Jumper W1 Tying Signal Ground to Frame Ground 13 4 2 Jumper W2 RTS Delay ee 14 4 3 Jumper W3 RXD Broadcast or Gated Mode 14 4 4 Jumper W4 Priority Sel
8. ection 4 and 8 Port Models Only 15 4 5 TimeOut Jumpers tette ttt ee bet Ro ee te Ven e Tasas 15 b Installation orion edes 18 6 Operation Port Selection eee en 20 7 22 7 1 Calling Your Supplier ie i a 22 7 2 Shipping and Packaging seen 22 Appendix Pin Descriptions tentent ten enenatis Rea ee etn 23 RS 232 DATA SHARERS 1 Specifications Interfaces Serial EIA RS 232C CCITT V 24 Master Port DTE Slave Ports DCE Asynchronous synchronous Full or half duplex Contention Type RTS CTS Clock External provided by DCE Data Rates Transparent to all data rates up to 115 2 Kbps User Controls Front panel switches RTS enabled disabled Jumpers RTS Delay 0 or 25 ms RXD Broadcast or Gated Mode RTS Timeout Period 10 or 30 seconds or none RTS Timeout Signal RXD only or RXD and TXD RS 232 Data Sharer 2 6 LEDs Power RTS RTS B Master Port CD CTS and RXD 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
9. he RTS Request to Send signal This condition called streaming can cause problems in a shared line system because a streaming slave can monopolize the shared line and prevent the slave s that are still working from accessing the master The RS 232 Data Sharer has a mechanism to prevent this You can set two groups of jumpers to define conditions under which the Sharer will cut off the active slave if it asserts RTS for too long in the absence of data activity One group of jumpers are the timeout period jumpers and can be set independently for each port 2 port units W4 Port A and W5 Port B 4 port units W5 Port A W6 Port B W7 Port C and W8 Port D 8 port units W5 Port A W6 Port B etc through W12 Port RS 232 DATA SHARERS Each of these jumpers determines how long the RS 232 Data Sharer will wait before cutting off access to the slave on the corresponding port if that slave keeps asserting RTS after data activity stops Settings Timeout 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 timeoutsignal 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 Por
10. ower supply 5 Ifyou need to set the RTS Enabled Disabled switches on the unit s front panel differently from the default settings do so now Your RS 232 Data Sharer system is now ready for continuous operation 6 Operation Port Selection Port selection is initiated by the presence of a Request to Send RTS signal on any slave port 1 Any number of terminals can raise their RTS signals and the corresponding LEDs on the front panel of the RS 232 Data Sharer will light The RS 232 Data Sharer will activate only oneslave port at a time On the 2 port model and on the 4 and 8 port models with jumper W4 set to the B C position the Sharer selects the active port according to hardware priority Port A is given the highest priority Port B has second highest priority and so on On the 4 and 8 port models with jumper W4 set to the B C position the Sharer selects as the active port the first port in its polling sequence whose attached device has RTS asserted All other slave ports are locked out until the active port drops its RTS signal 2 If jumper W2 is set to A B the Sharer asserts the RTS signal on 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 fo
11. pment This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de classe A prescrites dans le R glement sur le brouillage radio lectrique publi par Industrie Canada RS 232 DATA SHARERS 10 NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas Todas las instrucciones de operaci n y uso deben ser seguidas El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de bano lavabo s tano mojado o cerca de una alberca etc El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de oper
12. port won t be gated through to the slave port Since a slave port can t assert RTS and simultaneously receive data in half duplex operation Gated Mode is possible only in full duplex applications CHAPTER 4 Jumper Selectable Options 4 4 Jumper W4 Priority Selection 4 and 8 Port Models Only Jumper W4 determines whether the slave ports will a be polled for RTS sequentially or b prioritized with Port A given the highest priority and Port D or H given the lowest priority Settings W4 in A B position Sequential round robin polling factory default setting When the currently gated slave port drops RTS the Sharer will begin polling each port for RTS starting with the next port in sequence if C drops polling begins with D if F drops polling begins at G etc The Sharer will gate through to the master port the first slave port that it detects having RTS asserted true W4 in B C position Hardware priority When the currently gated slave port drops RTS the Sharer will begin looking for RTS starting with the highest priority port Port A and continuing 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 t
13. rwarded to all slave ports CTS will remain high until the active slave drops RTS or the master device drops CTS 3 If at any point the active slave begins streaming that is if it continuously asserts RTS without transmitting anything or if the corresponding timeout signal jumper is set to the B C position receiving anything and the corresponding timeout period jumper is not set to the C position no timeout for that port the RS 232 Data Sharer will begin a timeout countdown If the active slave drops RTS or begins to transmit or again depending on the jumper receive data the Sharer resets its timer If on the other hand the active slave keeps asserting RTS for the chosen number of seconds in the absence of the chosen type s of data activity CHAPTER 6 Operation Port Selection 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 mus
14. sition 25 ms RTS delay Jumper W3 in A B position RXD Broadcast Mode Jumper W3 in B C position RXD Gated Mode Timeout period jumpers 2 port units W4 and W5 4 port units W5 through WS8 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 16 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 Jumper W4 in B C position hardware prioritized Factory default setting CHAPTER 5 Installation 2 Connect the devices that you want to share the line to the slave ports Port A Port B etc on the rear of the RS 232 Data Sharer The slave ports are configured as DCE normally requiring straight through cabling to your DTE devices NOTE When matching terminals to slave ports keep the priority of the ports in mind On the 2 port model higher priority is given to 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 Plugin the Sharer s p
15. t A W14 Port B etc through W20 Port CHAPTER 4 Jumper Selectable Options These jumpers determine whether the Sharer monitors only the TXD Transmit Data signal or both the TXD and RXD Receive Data signals to decide when to start or reset the timeout timer Settings Timeout signal jumper in A B position TXD only The Sharer will start the timeout timer when the slave on the corresponding port either a is granted access and does not transmit anything but continues to assert RIS or b keeps asserting RTS after it stops transmitting data 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 transmitting or receiving data The Sharer will reset the timer if the slave drops RTS or resumes transmitting or receiving before the timeout expires The setting of a timeout signal jumper is irrelevant when the corresponding timeout period jumper is set to position C no timeout for corresponding port RS 232 DATA SHARERS 1 5 Installation Set all of the RS 232 Data Sharer s jumpers to suit your application Jumper W2 in A B position 0 ms RTS delay Jumper W2 in B C po
16. t 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 7 Troubleshooting 7 1 Calling BLACK BOX If you determine that your RS 232 Data Sharer is malfunctioning do not attempt to alter or repair the unit It contains no user serviceable parts Contact Black Box Technical Support at 724 746 5500 The problem may be solvable over the phone 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 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 e Ifyou are shipping the Sharer for repair include its po
17. t s device raises RTS e RTS Disabled A slave port s RTS detection is disabled when the port s switch is in the up position The port s RTS LED will always be off whether the port s device raises RTS or not 4 Jumper Selectable Options Refer to Figure 4 1 below for an overhead view of the internal circuit board of the RS 232 Data Sharer 2 model Refer to Figure 4 2 on the next page if you have a RS 232 Data Sharer 4 or RS 232 Data Sharer 8 RTS DELAY A B 0 B C 25 msec es we ABC we A W4 A H B A 32 sec 5 0 0 Timeout Disabled TIMEOUT MODE A B TXD Only B C RXD amp TXD w5 32 sec 10 sec Timeout Disabled Figure 4 1 Jumper locations on the PC board of the RS 232 Data Sharer 2 CHAPTER 4 Jumper Selectable Options 4 1 Jumper W1 Tying Signal Ground to Frame Ground Using jumper W1 you can tie signal ground to frame ground The position is left open at the factory If signal ground is to be connected to frame ground we recommend that you solder a 100 ohm 0 5 watt resistor in location W1 You can use a wire jumper instead of a resistor but make sure that ground circulating currents are limited to acceptable levels MASTER PORT H H 4 A B POLLED B C PRIORITIZED w4 CBA CBA CBA CBA W13 W16 W17 W20 B A A A A 0 8 8 8 8 0 0 0 0 PRIORITY J E F SELECTION 4 PORTAND CEI CIE clic 8 PORT MODELS Wi4 W15 W18 W19 ONLY
18. ter port output goes true Master broadcasts to all slaves simultaneously BLACK BOX Copyright 2000 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 e Fax 724 746 0746
19. trollers 5294 3274 etc IBM Mainframe RS 232 Data Sharer 4 Figure 2 1 Synchronous application an RS 232 Data Sharer in an IBM multipoint environment RS 232 DATA SHARERS 2 2 Typical Asynchronous Application In this kind of application the devices sharing the line the slave devices are usually local intelligent terminals or PCs The shared line runs from the RS 232 Data Sharer directly to a controller processor or host the master device The slave devices must be able to switch the Request to Send RTS signal and wait for the Clear to Send CTS signal before sending data This is because if a slave keeps RTS high the Sharer will think the slave is 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 Y Jumper in B C position RXD Gated Mode Jumper W4 4 and 8 Port Sharers only in B C position hardware prioritization Y Timeout period jumpers in B position 10 seconds y Timeout signal jumpers in A B position TXD only PCs with Communication Software Async RS 232 Lines Mainframe RS 232 Data Sharer 4 Figure 2 2 Asynchronous application
20. w3 0 8 A RXD MODE A B Broadcast B C Gated w2 ws Wi 2 eco 00011 0001 0010 CBA CBA CBA CBA RTS DELAY A B 0 B C 25 msec gure 4 2 Jumper locations on the PC board of the RS 232 Data Sharer 4 and 8 models 8 port unit shown RS 232 DATA SHARERS 4 2 Jumper W2 RTS Delay You can set jumper W2 for the amount of time you want the RTS signal to delay as it passes through the RS 232 Data Sharer from a slave port to the master port Settings W2 in A B position 0 ms delay no delay factory default setting W2 in B C position 25 ms delay as RTS goes from OFF to ON and no delay as RTS goes from ON to OFF 4 3 Jumper W3 RXD Broadcast or Gated Mode Depending on which way jumper W3 is set the Sharer will broadcast data out of all slave ports or out of only the active port Settings W3 in A B position 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 other slave ports will be forced to a marking state NOTE You must be operating in full duplex to use Gated Mode In half duplex operation a slave must drop its RTS signal before the master device can respond In Gated Mode a slave must have RTS asserted or data from the master
21. wer supply If you are returning the Sharer make sure you include everything you received with the unit Before you ship contact Black Box to get a Return Materials Authorization RMA number Appendix Pin Descriptions PIN 10 15 17 20 22 DIRECTION NAME MASTER PORT SLAVE PORT DTE DCE Frame Gnd TXD Output Input RXD Input Output RTS Output Input CTS Input Output DSR Input Output Signal Gnd CD Input Output Positive Signal passed through from DCE device Negative Signal passed through from DCE device TXC Input Output RXC Input Output DTR Output Input RI Input Output FUNCTION Hardwired connected to all ports Only enabled slave device transmits to the master signal is gated Master broadcasts to all slaves unless Gated Mode is selected When any slave goes true master port output goes true CTS is gated from master device to enabled slave device When enabled slave drops RTS CTS is gated to the slave with the highest priority Master broadcasts to all slaves simultaneously Hardwired connected to all ports Master broadcasts to all slaves simultaneously All Pin 9s internally interconnected no power is supplied on this pin All Pin 10s internally interconnected no power is supplied on this pin Master broadcasts to all slaves simultaneously Master broadcasts to all slaves simultaneously When any slave goes true mas

RS-232 Data Sharers

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