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13

CHAPTER 4: Option Selection

Signal

Name

Pin #

Mode

GND

Ground

7

TDB

TX+

Transmit Positive

24

Output RS-422

TDA

TX- 

Transmit Negative

25

Output RS-422

RDB

RX+

Receive Positive

12

Input RS-422

RDA

RX-

Receive Negative

13

Input RS-422

RS-530/422/485 Line Termination

Typically, each end of the RS-530/422/485 bus must have line-terminating
resistors. A 100-ohm resistor is across each RS-530/422/485 input, in addition
to a 1K ohm pull-up/pull-down combination that biases the receiver inputs.
DIP switch SW2 allows you to customize this interface to your specific
requirements. Each switch corresponds to a specific portion of the interface.
If multiple RS422/485 Serial Interface Plus adapters are configured in a
network, only the boards on each end should have switches 1, 2, and 3 ON.
Refer to the following table for each switch’s operation:

Name

Function

T

Adds or removes the 100-ohm termination. Switch 1 ON adds the 

termination, and OFF removes the termination.

P

Adds or removes the 1K ohm pull-up resistor in the RS-422/RS-485 

receiver circuit (Receive data only). Switch 2 ON adds the 1K pull-up 

resistor and OFF removes the pull-up resistor.

P

Adds or removes the 1K ohm pull-down resistor in the RS-422/RS-485 

receiver circuit (Receive data only). Switch 3 ON adds the 1K pull-down 

resistor, and OFF removes the pull-down resistor.

L

Connects the TX+ to RX+ for RS-485 two-wire operation.

L

Connects the TX- to RX- for RS-485 two-wire operation.

Содержание IC050C

Страница 1: ... Friday 877 877 BBOX FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com MARCH 2000 IC050C IC171C RS422 485 Serial Interface Plus ...

Страница 2: ...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 This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Reg...

Страница 3: ...nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El parato 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 eléc...

Страница 4: ...iado únicamente 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 1...

Страница 5: ...cluded 2 2 3 Features 3 2 4 Technical Description 3 3 Address Selection 6 4 Option Selection 8 5 Installation 15 5 1 Software Installation 15 5 1 1 Windows 3 1x 15 5 1 2 Windows 95 98 15 5 1 3 Windows 98 15 5 2 Hardware Installation 15 6 Windows 3 1 Installation 16 7 Troubleshooting 19 Appendix Circuit Board Design 23 ...

Страница 6: ...aximum Distance Up to 5000 ft 1524 m Communications Chip IC050C 16550 UART IC171C 16950 UART MTBF 150 000 hours MTTR 0 25 hours Materials Boards are solder mask over bare copper or tin nickel Operating Temperature 32 to 122 F 0 to 50 C Storage Temperature 4 to 158 F 20 to 70 C Humidity 0 to 90 relative humidity noncondensing Power 5 VDC 160 mA 1 Specifications ...

Страница 7: ...ing operating systems typically will not allow the user access to the low level registers of the UART chip without writing a specialized driver Since the RS422 485 Serial Interface Plus emulates an RS 232 port installation is as easy as picking an address and interrupt level The README file on the serial utility disk contains information about the latest changes and revisions To view this file ins...

Страница 8: ...0 UART This chip features programmable baud rate data format and interrupt control and a 16 byte input and output FIFO The IC171C uses a 16950 UART and has a 128 byte FIFO RS 422 RS 422 unlike RS 232 is a differential interface that defines voltage levels and driver receiver electrical specifications On a differential interface logic levels are defined by the difference in voltage between a pair o...

Страница 9: ...on a standard 37 pin D sub connector while RS 530 is backward compatible and is replacing RS 449 RS 530 is defined on a 25 pin D sub connector Figure 2 1 RS 422 530 Connection RS 485 This interface is very similar to RS 422 is several ways RS 485 is a differential interface that allows cable lengths up to 5000 feet 1524 m and data rates up to 10 Mbps The signal levels for RS 485 are the same as th...

Страница 10: ...nication software packages refer to RS 485 as RTS enable or RTS block mode transfer RS 485 can be cabled in two ways 2 and 4 wire mode Two wire mode does not allow for full duplex communication It requires that data be transferred in only one direction at a time and the two transmit pins be connected to the two receive pins Tx to Rx and Tx to Rx Four wire mode will allow full duplex data transfers...

Страница 11: ...ing options available with the standard PAL If you don t see an address option that suits your needs call Black Box about a custom PAL option Port 1 SW1 SW1 SW1 SW1 J2 1 2 3 4 Disabled ON ON ON ON 3F8 ON ON ON OFF 2F8 ON ON OFF ON 3E8 ON ON OFF OFF 2E8 ON OFF ON ON 3220 ON OFF ON OFF 3228 ON OFF OFF ON 4220 ON OFF OFF OFF 4228 OFF ON ON ON 238 OFF ON ON OFF 300 OFF ON OFF ON 308 OFF ON OFF OFF 280...

Страница 12: ...7 CHAPTER 3 Address Selection Figure 3 1 DIP Switch SW1 Address 3F8 Hex 1 2 3 4 ON OFF A B C D ...

Страница 13: ...s on the same IRQ setting and setting the appropriate selections at E3 Consult your particular software for IRQ selection If no interrupt is desired remove the jumper NOTE Most communications software applications default COM3 to IRQ4 and COM4 to IRQ3 This requires the sharing of interrupts between COM1 and COM3 and between COM2 and COM4 While this is the default it is not always the preferred set...

Страница 14: ...er port mode The S indicates the S hared interrupt mode which allows more than one port to access a single IRQ This is the preferred Windows and OS 2 setting Figure 4 3 Header E2 in Normal Mode Set jumpers to N for single interrupt mode This setting is the normal setting for most applications Set jumpers to S for shared interrupt mode for all ports sharing an IRQ except for one Set one of the port...

Страница 15: ...n Windows Windows NT and OS 2 environments where the lower level I O control is abstracted from the application program This means that the user can effectively use the RS422 485 Serial Interface Plus in a RS 485 application with existing software drivers Figure 4 5 This jumper is in the 422 position Note that the modem control outputs are only valid when Header E5 is in the 422 mode AUTO Driver a...

Страница 16: ...er or it can confuse your system if your software cannot handle it The RS422 485 Serial Interface Plus provides a jumper block E3 to enable or disable this function Figure 4 7 This should follow the selection made at E5 if No Echo is desired If Echo suppression is not desired then leave the jumper in the 422 position The modem control outputs are only valid when Header E3 is in the 422 mode AUTO R...

Страница 17: ...itive 22 Input RS 422 DSRA DSR Data Set Ready Negative 6 Input RS 422 DCDB DCD Data Carrier Detect Positive 10 Input RS 422 DCDA DCD Data Carrier Detect Negative 8 Input RS 422 TDB TX Transmit Positive 14 Output RS 422 TDA TX Transmit Negative 2 Output RS 422 RTSB RTS Request To Send Positive 19 Output RS 422 RTSA RTS Request To Send Negative 4 Output RS 422 DTRB DTR Data Terminal Ready Positive 2...

Страница 18: ...n of the interface If multiple RS422 485 Serial Interface Plus adapters are configured in a network only the boards on each end should have switches 1 2 and 3 ON Refer to the following table for each switch s operation Name Function T Adds or removes the 100 ohm termination Switch 1 ON adds the termination and OFF removes the termination P Adds or removes the 1K ohm pull up resistor in the RS 422 ...

Страница 19: ...14 RS422 485 SERIAL INTERFACE PLUS Figure 4 11 DIP Switch SW2 1 2 3 4 ON OFF 5 L L P P T ...

Страница 20: ...e installing the card Make note of the resources that Windows assigns the adapter and set the adapter to match those resources Power down the computer and install the adapter as described in Section 5 2 If you wish to change any resources assigned to the adapter refer to the help file installed in the Black Box folder in the Start Programs menu 5 1 3 WINDOWS NT For the ISA card run setup on disk t...

Страница 21: ...tion 1 Turn off PC power Disconnect the power cord 2 Remove the PC case cover 3 Locate an available slot and remove the blank metal slot cover 4 Gently insert the Card into the slot Make sure that the Card is seated properly 5 Replace the screw 6 Replace the cover 7 Connect the power cord Installation is complete ...

Страница 22: ...ts selection under the Control Panel Select the port you wish to configure Once you have selected the port click on the Settings button Cancel Settings Help Ports COM 1 COM 2 COM 4 COM 3 Control Panel Specifies communications settings for serial ports Settings Help Color International Data Time Network 386 Enhanced Drivers Sound Fonts Keyboard Desktop Mouse Ports Fonts 6 Windows 3 1 Configuration ...

Страница 23: ... Flow Control If you wish to select an IRQ or address different from the default click on the Advanced button Advanced Settings for COM 3 Base I O Port Address Interupt Request Line IRQ 03E8 10 OK Cancel Help Settings for COM3 Baud Rate 19200 Flow Control Stop Bits Parity Data Bits 8 None 1 None Advanced Help OK Cancel ...

Страница 24: ...er COM Port setting select the Don t Restart Now button and repeat this procedure until you have configured all new ports To make the changes take effect immediately select the Restart Now button System Setting Change Your COM Port settings have changed You will need to quit and restart Windows so that the new setting s can take effect Don t Restart Now Restart Now ...

Страница 25: ...the SSD COM Program found on your utility diskette Solution Verify that the RS422 485 Serial Interface Plus addresses are correctly set Reason If the board is incorrectly addressed your application will not respond The RS422 485 Serial Interface Plus transmits but does not receive The other side appears to receive but you do not receive any characters in your application How to identify the proble...

Страница 26: ...g IRQ 4 and 3 respectively This is a limitation of the mouse driver Reason A mouse is an interrupt hog Any movement or button pressing on the mouse causes an interrupt The application requires that the Modem Control signals be on or active but they aren t connected in my cable How to identify the problem Check the pinout of your cable and the device you are connected to Solution The unused modem c...

Страница 27: ...AT slot Solution Use the program SLT found on your utility diskette to verify that the interrupts are set correctly Note that SLT requires that the transmit and receive signals on the connector be looped back or connected together This can be accomplished by setting SW2 4 and 5 ON Reason AT IRQs are not found on the 8 bit slots only on 16 bit slots The higher level interrupts can never be used in ...

Страница 28: ...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 RS422 485 Serial Interface Plus Package it carefully We recommend that you use the original container If you are shipping the Serial Interface Plus for repair make sure...

Страница 29: ... SW1 A T P P L L R1 B C D RP1 1 AUTO RTS 422 E3 RX R2 75173 U8 C7 R4 R3 R18 R6 R5 14 1 N S M E2 D1 C9 U5 C4 E1 2 3 4 5 7 10 11 12 15 P2 P1 SLS07 22V10 C6 74LS245 U7 25 13 R14 R7 R8 R9 R10 R11 R12 R13 E1A 530 S10 485 R17 R16 TX C8 R15 E4 AUTO RTS 422 E5 75174 U9 P3 16550 Appendix Circuit Board Design ...

Страница 30: ...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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