Models SPRT2A & SPRT2B/AT Advanced Multi-Channel RS-232/422/485 Interface and Serial Card FEATURES � Dual RS-232/422/485 Interface � 16550 Buffered UART � PC Compatible, Speeds to 115K bps � Selectable Address Including COM1: through COM4: or any other I/O Address up to 3FF Hex � Individually Selectable Interrupts (2-5) on SPRT2A/AT � Individually Selectable Interrupts (2-5, 7, Model SPRT2B/AT 10-12, and 15) on SPRT2B/AT � Multiple Ports can share the same IRQ Line � Multiple Cards can share the same IRQ Line � RS-485 Two or Four Wire Operation � RTS and CTS �Handshake� Signals Provided Model SPRT2A/AT The Model SPRT2A/AT provides the PC with two, direct RS-232/422/485 asynchronous links, to data APPLICATIONS collection and other devices. Operationally independent ports allow users the choice of two ports as RS-232, or � Interface for Factory Automation RS-422/485, or one port of each type. Distances of up to Equipment 5000ft. are easily accommodated. The Model SPRT2A/ � RS-232 Networks and PCL AT allows PC based systems to be used in a variety of Communications industrial and networking applications requiring long � Multi-Drop Data Collection Devices distances or multi-drop communications. � Time Clocks, Bar Code Readers, Digital The Model SPRT2B/AT provides the same features Scales as the Model SPRT2A/AT while adding �AT� interrupts; (10-12 and 15). This is important when running applications that require multiple serial ports where each serial port must have its own IRQ line, (i.e. Microsoft Windows). 1 Document 1067, 2/20/97 CONNECTOR PIN-OUTS CONT. RS-232 Interface: Signal Name PIN # MODE TD TRANSMIT DATA 3 OUTPUT RS-232 RTS REQ. TO SEND 7 OUTPUT RS-232 RD RECEIVE DATA 2 INPUT RS-232 CTS CLEAR TO SEND 8 INPUT RS-232 GND GROUND 5 DCD DATA CARRIER DETECT 1 INPUT RS-232 DSR DATA SET READY 6 INPUT RS-232 DTR DATA TERMINAL READY 4 OUTPUT RS-232 RI RING INDICATOR 9 INPUT RS-232 RS-422/485 Interface: J1 AND J2 CONNECTOR PINOUT: SignalName PIN # MODE GND GROUND 5 RX+ RECEIVE POSITIVE 1 INPUT RS-422 RX- RECEIVE NEGATIVE 2 INPUT RS-422 CTS+ CLEAR TO SEND POS. 9 INPUT RS-422 CTS- CLEAR TO SEND NEG. 8 INPUT RS-422 TX+ TRANSMIT POSITIVE 4 OUTPUT RS-422 TX- TRANSMIT NEGATIVE 3 OUTPUT RS-422 RTS+ REQ. TO SEND POS. 6 OUTPUT RS-422 RTS- REQ. TO SEND NEG. 7 OUTPUT RS-422 Model SPRT2A & 2B/AT EXTENDED INTERRUPTS The original IBM XT only provided two interrupt (10-12 and 15) each COM: port can have a dedicated IRQ request (IRQ) lines for the COM1: and COM2 serial line, resulting in higher throughput and very reliable ports. Some programs allow COM3: and COM4: to communications. Many of the advanced operating systems share these IRQ lines with COM1: and COM2:. This (i.e. Windows 3.1, OS/2, and Windows NT) require each works well but can slow down interrupt processing, port to be on separated IRQ due to the multitasking nature resulting in serial communication errors and lost serial of the operating system architecture. data. By providing access to the unused �AT� interrupts SPECIFICATIONS Communications Chip RS-485 Operation 16550 UART Two or four wire Operating Temperature Number of Ports Dual RS-232/422/485 0-50� C Storage Temperature Max. Data Rate 115K bps (RS-422/485) -20-70� C Interrupts Humidity range 0-90% R.H. SPRT2A/AT: 2-5 SPRT2B/AT: 2-5, 7, 10-12, 15 Current specifications Max. Data Distance +5V @ 195mA, –12V @ 25mA ea. Up to 5000ft. Connector(s) DB-9P ORDERING GUIDE Model SPRT2A/AT Model SPRT2B/AT 2-port Card, Software & Manual 2-port Card, Software & Manual