VMIVME-6015 Quad-Serial Input/Output Interface Board • A16:D8 • Four full-duplex channels • Fully programmable synchronous/asynchronous operation • RS-232C, RS-423, RS-422A, and RS-485 compatible • 0 to 1 Mbaud data rate • Self-test capability • Programmable interrupt capability • Modem control lines for each channel • Uses four industry-standard 25-pin subminiature D connectors • Double Eurocard form factor • Four programmable baud rate generators • Asynchronous features — 5, 6, 7, or 8 bits/character — 1, 1 1/2, or 2 stop bits — Even, odd, or no parity — Break generation and detection — Parity, overrun, and error detection • Synchronous features — Compatible with byte-oriented protocols such as IBM BiSync Asynchronous features — Compatible with byte-oriented protocols such as HDLC and IBM SDLC — 5, 6, 7, or 8 bits/character — Internal CRC generation • Supports half-duplex 1 Mbaud RS-485 LAN (local area network) — 1, 1 1/2, or 2 stop bits • Sample software available — Even, odd, or no parity — x1, x16, x32, and x64 clock modes INTRODUCTION — The VMIVME-6015 Serial — Break generation and detection Input/Output (SIO) is a quad-channel multifunctional — Parity, overrun, and framing error detection peripheral interface board, designed to satisfy a wide variety of serial data communications requirements in VMEbus Byte synchronous features systems. The basic function of the VMIVME-6015 is a — One or two sync characters in separate serial-to-parallel, parallel-to-serial controller; however, it is registers software configurable so that its “characteristics” may be — Automatic sync character insertion optimized for any given serial data communications — CRC-16 or CRC-CCITT block check generation application. and checking The VMIVME-6015 is capable of handling Bit synchronous features asynchronous protocols, synchronous byte-oriented — Abort sequence generation and detection protocols (such as IBM BiSync), and synchronous — Automatic zero insertion and deletion bit-oriented protocols (such as HDLC and IBM SDLC). This — Automatic flag insertion between messages SIO Controller can also be used to support virtually any serial — Address field recognition protocol for applications other than data communications — I-field residue handling (cassette or floppy disk interface, for example). — Valid receive messages protected from overrun — CRC-CCITT block check generation and checking The VMIVME-6015 can generate and check CRC codes in any synchronous mode and may be programmed to check SIGNAL CONDITIONING OPTIONS — The data integrity in various modes. The controller also has VMIVME-6015 Quad-SIO Board is designed to support a facilities for modem controls, and in applications where these wide variety of signal conditioning options, such as EAI, controls are not needed the modem controls may be used for RS-232, RS-422, RS-423, and RS-485. Jumpers are provided general-purpose I/O. to allow the user to independently configure each I/O channel. In addition to the signal conditioning options listed above, The VMIVME-6015 is designed with two MK68564 each channel of the SIO Board may be configured as an SIO dual-channel multifunctional peripheral circuits that RS-485 token passing network. support a self-test capability. When the loop mode bit is set in the command register, the loop mode is activated to support Ordering Options Built-in-Test functions. November 11, 1996 800-006015-000 E VMIVME-6015 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 E-mail: info@vmic.com Web Address: www.vmic.com Copyright © January 1986 by VMIC Specifications subject to change without notice. VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 1 VMIVME-6015 SELF-TEST — The MK68564 SIO chip is designed This network allows full duplex operation over two pairs of with internal self-test logic that supports a loop test on each twisted-pair wires. SIO channel. When the loop mode bit is set in the command register, the receiver shift clock input pin (RxC) and the SPECIFICATIONS receiver data input pin (RxD) are electrically disconnected from the internal logic. The transmit data output pin (TxD) Slave Data Transfer Options: A16: D8 is connected to the internal receiver data logic, and the transmit shift clock pin (TxC) is connected to the internal Interrupter Options: Any one of I1 to I7 DYN for receiver shift clock logic. All other features of the SIO are each of two-channel pairs unaffected. Power Requirements: RS-485 TOKEN PASSING NETWORK — VMIC’s 1.6 A maximum (0.85 A typical) at +5 VDC Model VMIVME-6015 SIO interface provides an easy 100 mA maximum (0.80 mA typical) at +12 VDC connection to the new RS-485 interface standard. RS-485 is 100 mA maximum (0.80 mA typical) at -12 VDC an upgraded version of the earlier RS-422 standard for balanced voltage digital interface circuits. Up to 32 RS-485 PHYSICAL/ENVIRONMENTAL devices can be multidropped onto a single low-cost 24-gauge twisted-pair cable, forming a half-duplex network. The Temperature: 0 to 60 °C, operating RS-485 transmitter in the VMIVME-6015 is controlled via the RS-232 request-to-send signal. The RS-485 interface is Humidity: 0 to 90 percent, noncondensing typically capable of 0 to 100 kbaud at distances up to 4,000 feet. PHYSICAL CONFIGURATION A network of RS-485 devices would normally be Double Eurocard: 160 x 233.4 x 12.5 mm NEXP implemented in a token bus topology. All devices would be wired in line, one after another, forming a single main bus. I/O CONNECTION One device would have the imaginary token, and thereby the ability to transmit onto the bus. All the RS-232 devices Four 25-pin subminiature D female connectors mounted connected to the bus via a VMIVME-6015 need to share on front panel some common software in order to determine which device has possession of the token, and to control their I/O SIGNAL CONDITIONING LEVEL COMPATIBILITY request-to-send signals. (Jumper-Selectable) RS-485 improvements over RS-422 include higher Data Lines: RS-232C, RS-422A, RS4-23, and receiver input impedance, increased generator drive, and a RS-485 greater common-mode voltage range. The VMIVME-6015 will operate with a common-mode voltage (ground potential Control Lines: RS-232C difference) of ±7 V peak. This means the ground voltage difference between any two VMIVME-6015s in a network STANDARD DATA RATES SUPPORTED can be up to 7 V. Since the signal grounds between RS-485 devices are normally not connected, problems caused by 76.8 K, 38.4 K, 19.2 K, 9,600, 7,200, 4,800, 3,600, ground loop currents are virtually eliminated. This fact, 2,400, 2,000, 1,800, 1,200, 600, 300, 110 along with the inherent common-mode noise rejection of differential transmission, makes RS-485 a viable interface for OTHER RATES SUPPORTED multipoint communication in both data processing and industrial control applications. 1 M, 500 K, 333 K, 250 K, 167 K, 143 K, 125 K, 111 K, 100 K, 62.5 K, 50 K, 33 K, 25 K Other types of networks include those with a single transmitter and multiple receivers, and those with a single TRADEMARKS receiver and multiple transmitters. Both types of these networks are commonly used where there is one controlling The VMIC logo is a registered trademark of VMIC. device (master) and several devices being controlled (slaves). Other registered trademarks are the property of their respective owners. 2 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 VMIVME-6015 VMEbus P1 P3 C O S N B I D U G DATA 68564 I F N T SIO F P4 A I E L O R N I N G P5 C O B N S D U I ADDRESS F I 68564 G P6 T F SIO N E I A O R L N I N G CONTROL B U CNTLS F F E R D R 68153 INTERRUPT I BIM V E R Figure 1. Functional Block Diagram VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 3