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Octagon 5554, User Manual

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Octagon 5554 User Manual Download Page 23

RS–422/485 – 15

CHAPTER 3

RS–422/485

RS–422/485 COMPATIBILITY

With the 5554/5558 you can change port 3 and/or port 4 from
RS–232 operation to RS–422/485.  The RS–422/485 compatible
ports are accessed through P2 and P3.  You can connect up to 32
units on a multidrop RS–485 network.  However, only one trans-
mitter can be active at a time.  Although no wire type or maximum
wire length is specified in the EIA 485 specification, the EIA 422
specification (which is very similar) lists a maximum length of
4000 ft.  Jumper block W5 configures the card for the RS–422/485
option and also installs or removes the termination network.  A
termination network must be installed at the last receiver of the
network.  Failure to do so may cause spurious oscillation on the
receive line and corrupt incoming data.

W5: RS-422/485 Select and Network Termination

Port

Pins Jumpered

Description

P2

[10-12]*

RS-422/485 inactive

P2 Active & Terminated

[8-10]

Receive data at port 3

[13-15]*

Plus termination

[14-16]*

Minus termination

P2 Active & Unterminated

[8-10]

Receive data at port 3

[15-17]

Plus termination

[16-18]

Minus termination

P3

[9-11]*

Inactive

P3 Active and Terminated

[7-9]

Receive data at port 4

[1-3]*

Plus termination

[2-4]*

Minus termination

P3 Active & Unterminated

[7-9]

Receive data at port 4

[3-5]

Plus termination

[4-6]

Minus termination

* = default

NOTE:  When activating the RS–422/485 option, serial I/O ports
at J3 and/or J4 are not available.

Summary of Contents for 5554

Page 1: ...5554 5558 User s Manual Doc 03580 Rev 0198 OCTAGON SYSTEMS CORPORATION 6510 W 91st Ave Westminster CO 80030 Tech Support 303 426 4521 ...

Page 2: ... in this manual is believed to be correct However Octagon assumes no responsibility for any of the circuits described herein conveys no license under any patent or other right and makes no representations that the circuits are free from patent infringement Octagon makes no representation or war ranty that such applications will be suitable for the use specified without further testing or modificat...

Page 3: ... designed to be high in performance while consuming very little power In order to maintain this advantage CMOS circuitry is used CMOS chips have specific needs and some special requirements that the user must be aware of Read the following to help avoid damage to your card from the use of CMOS chips ...

Page 4: ...e wrong jumper settings or the customer has problems with the software This causes frustration for the customer and incurs a testing charge from Octagon Of the remaining 80 of the cards 90 of these cards fail due to customer misuse and accident Customers often cannot pinpoint the cause of the misuse Therefore 72 of the returned cards are damaged through some type of misuse Of the remaining 8 Octag...

Page 5: ...re mechanism has been induced Therefore a failure will probably occur in the future For such cards Octagon highly recommends that these cards be replaced Other over voltage symptoms In over voltage situations the programmable logic devices EPROMs and CPU chips usually fail in this order The failed device may be hot to the touch It is usually the case that only one IC will be overheated at a time P...

Page 6: ... cards Using desktop PC power supplies Occasionally a cus tomer will use a regular desktop PC power supply when bringing up a system Most of these are rated at 5V at 20A or more Switching supplies usually require a 20 load to operate properly This means 4A or more Since a typical Micro PC system takes less than 2A the supply does not regulate properly Customers have reported that the output can dr...

Page 7: ...ent 7 Installation 7 Base Address 10 Interrupt Selection 10 Installing the 5554 5558 13 CHAPTER 3 RS 422 485 15 RS 422 485 Compatibility 15 Operating Precautions 16 Baud Rate 16 Two or Four Wire Communication 16 Transmission Timing 17 Programming Example 18 CHAPTER 4 TECHNICAL DATA 21 Technical Specifications 21 Jumper Settings 22 Connector Pinouts 24 PC Bus Pinouts 25 WARRANTY ...

Page 8: ...ii ...

Page 9: ...PC products are modular so creating a system is as easy as selecting and plugging in the products you need CONVENTIONS USED IN THIS MANUAL 1 Information which appears on your screen output from your system or commands or data that you key in is shown in a different type face note the line breaks may not match those on your screen but the message will be similar Example 1 Octagon 5025 ROM BIOS Vers...

Page 10: ... the following symbols and terminology are used W Denotes a jumper block and the pins to connect NOTE Information under this heading presents helpful tips for using the 5700 Card Information under this heading warns you of situations which might cause catastrophic or irreversible damage H The suffix H denotes a hexadecimal number For example 1000H in hexa decimal equals 4096 in decimal TTL Compati...

Page 11: ...not find the answer in this manual call Technical Support They will be ready to give you the assistance you need When you call please have the following at hand Your 5554 5558 Quad Octal Serial Card User s Manual A description of your problem The direct line to Technical Support is 303 426 4521 ...

Page 12: ...Preface 4 This page intentionally left blank ...

Page 13: ...selectable to RS 422 485 operation RS 485 Operation Both RS 485 ports use a 5 position terminal block The blocks are routed to serial ports three and four Each of the two RS 485 ports can be terminated or unterminated via jumper block W5 Industry Standard 16C450 UART Compatible Each of the serial channels can operate either in a polled or interrupt mode The interrupt mode is enabled via an interna...

Page 14: ...Overview 6 This page intentionally left blank ...

Page 15: ...maged To avoid damaging your card and its components 1 Ground yourself before handling the 5554 5558 Quad Octal Serial Card 2 Disconnect power before removing or inserting the 5554 5558 card EQUIPMENT You will need the following equipment or equivalent to use your 5554 5558 Micro PC Control Card or Microcontroller 5554 5558 Quad Octal Serial Card 5554 5558 Utility Disk Micro PC Card Cage Power Mod...

Page 16: ...14 U15 U13 U5 U3 U4 U1 U2 U7 J2 J6 J8 J4 J1 J3 J5 J7 RS 232 RS 232 RS 422 485 P3 P2 Base Address Select and Quad Octal Select Interrupt Select Interrupt Channeling RS 422 485 Select and Network Termination 1 5 11 17 1 2 1 2 1 2 Figure 2 1 5554 5558 Component Diagram ...

Page 17: ...4 J2 J4 J3 J1 J8 P2 P3 J5 J7 J6 Port 3 Port 4 RS 422 485 RS 422 485 Port 3 Port 4 W5 RS 422 485 Config Termination Quad Serial I O Control Ports 5 8 Interrupt Funnel W3 W2 W1 W4 Access Indicator Port 5 Port 6 Port 7 Port 8 Port 1 Port 2 Base 7 Transceivers PC Bus Figure 2 2 5554 5558 Functional Block Diagram ...

Page 18: ...n your system with a base address of 100H you must use a different base address for the 5554 5558 or the other expansion card W4 Base Address Select Pins Jumpered Base Address 5554 Quad 5558 Octal 1 2 3 4 5 6 1 2 3 4 100H 1 2 5 6 1 2 140H 3 4 5 6 3 4 180H 5 6 Not jumpered 1C0H default NOTE Jumpers 5 6 should not be connected on the 5558 Octal Card Interrupt Selection There are five interrupts avai...

Page 19: ... applies to the 5558 ports 5 8 With the four port 5554 only one interrupt is available The interrupt signal from each port is combined into one interrupt source That interrupt source can be jumpered to one of five hardware interrupts at W1 The interrupt channeling at W3 must be set for Quad operation with one interrupt W3 Interrupt Channeling Pins Jumpered Interrupts 2 3 Quad 1 interrupt 1 2 Octal...

Page 20: ... either one or two interrupt operation and the hardware interrupt configured at W1 and W2 NOTE The IRQ selected by W1 must be different than the IRQ selected by W2 Also on a 5558 configured for just one interrupt source W3 1 2 should be jumpered W2 should also be configured as No interrupts pins 1 3 The following table shows the relationship between the various ports and connectors 5554 5558 Ports...

Page 21: ...closest to you The lettering on the backplane should be right side up for example you should be able to read A31 on the backplane with the words OCTAGON SYSTEMS CORP running vertically along the left side of the backplane This position is feet down for a table mount cage and feet back for a rear mount 4 Slide the 5554 5558 into the card cage The components on the card should face to the left The l...

Page 22: ...st the 5554 5558 download the program 5558TST EXE to your Control Card and execute the program Refer to your Control Card user s manual for more information on downloading files Refer to the READ ME on the utility disk for more information on the example programs 7 The amber LED will light briefly whenever the 5554 5558 card is accessed input or output ...

Page 23: ...termination network A termination network must be installed at the last receiver of the network Failure to do so may cause spurious oscillation on the receive line and corrupt incoming data W5 RS 422 485 Select and Network Termination Port Pins Jumpered Description P2 10 12 RS 422 485 inactive P2 Active Terminated 8 10 Receive data at port 3 13 15 Plus termination 14 16 Minus termination P2 Active...

Page 24: ...The 5554 5558 supports software selectable baud rates of 300 1200 2400 4800 9600 19 2K 38 4K 56K and 115 2K Two or Four Wire Communication The 5554 5558 ports 3 and 4 can be configured for either two wire half duplex or four wire full duplex communication The choice of the configuration is application specific and also dependent on the protocol of the network software Figures 3 1 and 3 2 show how ...

Page 25: ...or the associated port The register for the DTR signal is located at address Base 24H for P2 and Base 34H for P3 Bit 0 of the register must be cleared to a 0 to enable the RS 422 485 transmitter After the last byte of the information is sent the transmitter must be disabled Before disabling the transmitter make sure the following conditions exist The UART transmitter holding register is empty The ...

Page 26: ...ars DECLARE SUB initports DIM rcbuf 8 80 DIM rcvcnt 8 DIM rs485 8 COMMON SHARED boardadd statusadd maxports COMMON SHARED rcvbuf rcvcnt rs485 boardadd H100 statusadd boardadd 7 maxports 8 CALL initports CALL PRINTSL Sending COM1 outport 1 CALL sendstring 1 COM1 CALL PRINTSL Waiting to receive from any port CALL PRINTSL Press any key to end test DO CALL rcvchars go get some characters FOR port 1 TO...

Page 27: ...ortadd bdlsb set divisor latch LSB OUT portadd 1 bdmsb set divisor latch MSB OUT portadd 3 N81 set parity data bits stop bit OUT portadd 1 RD receive data interrupt OUT portadd 4 RTS DTR INTRPT set RTS DTR intrpt rcvcnt port 0 initialize receive buffer count NEXT enable fcv transmit fifo clear fifos set rcv fifo int level to 1 FOR port 1 TO maxports portadd boardadd port 1 8 OUT portadd 2 7 NEXT E...

Page 28: ...portbase 5 AND H40 0 WEND OUT portbase 4 HB turn DTR on when done for 485 END IF END SUB SUB rcvchars status INP statusadd DO port 1 portadd boardadd poll to receive characters WHILE status 0 IF status AND 1 THEN rcvcnt port rcvcnt port 1 rcvbuf port rcvcnt port INP portadd END IF status INT status 2 portadd portadd 8 port port 1 WEND status INP statusadd LOOP WHILE status 0 END SUB ...

Page 29: ...p 5554 5558 I O Map Serial Card Port W4 1 2 3 4 W4 1 2 W4 3 4 W4 None Base 100H Base 140H Base 180H Base 1C0H 5558 Octal Port 1 100 140 180 1C0 Port 2 108 148 188 1C8 Port 3 110 150 190 1D0 Port 4 118 158 198 1D8 Port 5 120 160 1A0 1E0 Port 6 128 168 1A8 1E8 Port 7 130 170 1B0 1F0 Port 8 138 178 1B8 1F8 5554 Quad Port 1 100 140 180 1C0 Port 2 108 148 188 1C8 Port 3 110 150 190 1D0 Port 4 118 158 1...

Page 30: ...Q 4 COM1 COM3 5 6 5 6 IRQ 5 Hard disk 7 8 7 8 IRQ 6 Floppy disk 9 10 9 10 IRQ 7 LPT 1 3 1 3 No interrupts NA default Not used by Datalight ROM DOS NOTE W2 applies to the 5558 ports 5 8 W3 Interrupt Channeling Pins Jumpered Interrupts 2 3 Quad 1 interrupt 1 2 Octal 1 interrupt 2 3 Octal 2 interrupts default for 5554 default for 5558 ...

Page 31: ...ermination Port Pins Jumpered Description P2 10 12 RS 422 485 inactive P2 Active Terminated 8 10 Receive data at port 3 13 15 Plus termination 14 16 Minus termination P2 Active Unterminated 8 10 Receive data at port 3 15 17 Plus termination 16 18 Minus termination P3 9 11 Inactive P3 Active and Terminated 7 9 Receive data at port 4 1 3 Plus termination 2 4 Minus termination P3 Active Unterminated ...

Page 32: ...OR PINOUTS Serial Ports J1 J8 Pin Function Direction 1 DCD In 2 DSR In 3 RxD In 4 RTS Out 5 TxD Out 6 CTS In 7 DTR Out 8 RI In 9 Gnd 10 5V active low RS 422 485 P2 P3 Pin Function R Receive R Receive T Transmit T Transmit G Gnd ...

Page 33: ...A17 A14 O A2 D7 I O A18 A13 O A3 D6 I O A19 A12 O A4 D5 I O A20 A11 O A5 D4 I O A21 A10 O A6 D3 I O A22 A9 O A7 D2 I O A23 A8 O A8 D1 I O A24 A7 O A9 D0 I O A25 A6 O A10 I O CH RDY I A26 A5 O A11 AEN O A27 A4 O A12 A19 O A28 A3 O A13 A18 O A29 A2 O A14 A17 O A30 A1 O A15 A16 O A31 A0 O A16 A15 O active low ...

Page 34: ...K0 O B4 IRQ2 I B20 CLOCK O B5 5V Not used B21 IRQ7 I B6 DRQ2 I B22 IRQ6 I B7 12V Not used B23 IRQ5 I B8 Reserved Not used B24 IRQ4 I B9 12V Not used B25 IRQ3 I B10 Analog Gnd Not used B26 DACK2 I B11 MEMW O B27 T C I B12 MEMR O B28 ALE O B13 IOW O B29 Aux 5V Not used B14 IOR O B30 OSC O B15 DACK3 O B31 Aux Gnd I B16 DRQ3 I active low ...

Page 35: ...he design capability capacity or suitability for use of the Software Software is licensed on an AS IS basis without warranty The warranty and remedies set forth above are in lieu of all other warranties expressed or implied oral or written either in fact or by operation of law statutory or otherwise including warranties of merchantability and fitness for a particular purpose which Octagon specific...

Page 36: ...tions and limitations may apply to international shipments NOTE PRODUCTS RETURNED TO OCTAGON FREIGHT COLLECT OR WITHOUT AN RMA NUMBER CANNOT BE ACCEPTED AND WILL BE RETURNED FREIGHT COLLECT RETURNS There will be a 15 restocking charge on returned product that is unopened and unused if Octagon accepts such a return Returns will not be accepted 30 days after purchase Opened and or used products non ...

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