PCM-COM4A Four Channel PC/104 MODULE Serial I/O FEATURES � Four independent 8250 compatible serial channels � 16 byte transmit FIFO � 16 byte receive FIFO with error flags � Modem control signals: CTS, RTS, DSR, DTR, RI and DCD on each channel � Programmable serial interface characteristics for each channel • 5-, 6-, 7-, or 8-bit character lengths  Even, odd, or no parity generation and checking  1, 1.5, or 2 stop bits  Local internal loopback for diagnostics � Shared interrupt capability with status ID register � RS-232 and optional RS-485 and RS-422 electrical interface levels on all channels � Asynchronous data rates to 115,200 bps � Software programmable baud rate generator � Jumper selectable board I/O address � +5 volt only operation � Small size: 3.6" x 3.8" (90mm x 96mm) o o � Operating temperature: -40 C to +85 C The PCM-COM4A is a 4 channel serial INS8250 compat- set up to provide internal diagnostics such as loopback ible PC/104 module based on the 16C554. It is ideally and echo mode on the data stream. suited for applications running DOS programs or lan- guages that require exact register compatible hardware Electrical Interface Levels - The board is shipped in a for program execution on software such as Greenleaf standard configuration that supports RS-232. Only +5 Comm Library, CROSSTALK, etc. Each channel supports volts is required for the board since the Maxim MAX208 RS-232 with optional RS-485 and RS-422 electrical levels chip is used which generates the plus and minus volt- to interface to a wide variety of serial communications ages required for RS-232. devices such as modems, data collection equipment, and distributed I/O terminals. The PCM-COM4A will operate Optionally, RS-422/485 electrical levels can be support- o o over the full industrial temperature range of -40 to +85 ed on all 4 channels. The RS-422/485 configuration Centigrade. provides separate balanced transmit and receive signal pairs. For RS-485 multidrop lines, one signal pair can be FUNCTIONAL CAPABILITY used for "party line" networks. The PCM-COM4A is designed to properly disable the Serial Controller - A 16C554 serves as the serial com- transmitter upon reset to prevent potential lock-up munication controller. It is an improved version of the problems caused by a transmitter stuck in the ON 16C450 UART with higher operating speed and lower mode. Both the RS-422/485 transmitter and receiver access time. It has four independent, double buffered, lines permit user installable termination resistors for asynchronous channels that are 8250 hardware compat- impedance matching and biasing. ible. The unit contains on-chip software program- mable baud rate generators selectable through 115,200 WinSystems' CK-75176-2 chip kit can be ordered for bits per second. Each channel has a 16 byte transmit each channel that contains two 75176B devices. The and receive FIFO for use with high speed data commu- parts can be easily installed by the user. nications. A FIFO register is used to enable the FIFOs, clear the FIFOs, and set the receiver FIFO trigger level. All serial channels are configured as Data Terminal Each channel will support 5-, 6-, 7-, or 8-bit characters Equipment (DTE) and wired to two 20-pin right angle with even, odd or no parity generation and checking. It connectors. WinSystems offers the optional CBL-173-1 will handle 1, 1.5, or 2 stop bits. Each channel can be which adapts each serial channel pair to two standard PC/104 Interface - The PCM-COM4A is I/O mapped. Each channel requires 8 port addresses and each is inde- pendently decoded within the I/O map. The Interrupt Status Register also requires one I/O port. The addresses are decoded in a PAL and jumper selectable with 8 dif- ferent I/O maps. The PCM/104 card is an 16-bit stackthrough card sup- porting 8-bit data transfers only. Custom Configurations - For OEM applications, the PCM-COM4A can be shipped from the factory with your specific RS-232 and RS-422/485 configuration. Contact the factory for details. SPECIFICATIONS Electrical PC/104 Bus: 16-bit, stackthrough Serial: 4 RS-232 asynchronous channels. Optional RS-422/485 with the CK-75176-2 installed per channel ± Vcc = +5V 5% @ 80mA PCM-COM4A BLOCK DIAGRAM Mechanical Dimensions: 3.6" x 3.8" (90mm x 96mm) 9-pin male D type connectors. Two cables are required PC board: 4 layer FR4 epoxy glass with to support all 4 channels. The standard serial channel screened component legend AT compatible pinout is shown in the chart. Connectors CBL-173-1 RS-232 Pin-Out Serial: Two, 20-pin 0.100" grid Pin FLOW Signal PC/104: 64-pin, 0.100" (32-pin double row) 40-pin, 0.100" (20-pin double row) 1 IN Data Carrier Detect (DCD) 2 IN Receive Data (RxD) Jumpers: 0.025" square posts 3 OUT Transmit Data (TxD) 4 OUT Data Terminal Ready (DTR) Environmental 5 -- Signal Ground (GND) o o 6 IN Data Set Ready (DSR) Operating Temperature: -40 to +85 Celsius 7 OUT Request To Send (RTS) Non-condensing relative humidity: 5% to 95% 8 IN Clear To Send (CTS) 9 IN Ring Indicator (RI) ORDERING INFORMATION Interrupts - Interrupts are generated on error condi- PCM-COM4A-16-2 Four channel, RS-232 serial PC/104 tions or receive/transmit buffer status for each of the module with 16-bit interface. serial channels. Each of the 4 channels can be routed to PCM-COM4A-16-4 Four channel, RS-422/485 module the PC/104 Bus connector. Alternatively, all four chan- with 16-bit interface. nels can share one interrupt line. The PCM-COM4A sup- CBL-173-1 20-pin ribbon to two male 9-pin "D" ports IRQ channels 2, 3, 4, 5, 6, 7, 10, 11, 12, 14 and 15. connector adapter cable The PCM-COM4A also contains a Read Only Interrupt CK-75176-2 RS-422/485 chip kit for 1 channel Status Register to allow quick identification of the UART channel(s) needing service. 715 Stadium Drive • Arlington, Texas 76011 • (817) 274-7553 • http://www.winsystems.com