Parker ACR2000 Hardware Manual

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Parker ACR2000 Hardware Manual Manual pdf 16 page image

ACR2000 Hardware ManualP/N PM081176ACR2000 MOTHERBOARD SWITCHESAddress Selection Switch (SW1)The ACR2000 can receive and transmit data through I/O ports on a PC BUS. Theaddresses of these ports are selectable using SW1 on the ACR2000 motherboard. Thedata port is used to both transmit and receive. Both the transmit and receive channels areconnected to 512 byte First In / First Out (FIFO) hardware buffers.Refer to Figure 1 for switch location.The status port is used to see if data is waiting to be received from the card and if it is OKto send data to the card. The byte read from the status port is defined as follows:BIT Definition DescriptionBIT7 Transmit Not Full Clear to send one byteBIT6 Transmit Not Half Empty Clear to send up to 255 bytesBIT5 Receive Not Empty Data AvailableBIT4 Transmit Not Empty Still something in the bufferTable 1.1 ACR2000 PC BUS Status Port BitsThe following table shows how the switch positions relate to the ACR2000 card numberand I/O port addresses.Note that Switch 4 should be left in the “OFF” position, unless using the Flash BypassMode of operation. Flash Bypass Mode is selected when the user does not want to loadthe program information from flash at power-up or reset. The card will not communicatevia the PC BUS at Card Number 15, so after the board is powered-up or reset in FlashBypass Mode, the SW1 settings must be placed back to a valid card number. Serialcommunications via the COM1 and COM2 communication ports on the ACRCOMMmodule will recognize the card as Card Number 15. However, the card should be placedback to a valid card number during normal operation.Card SW1 Settings AddressesNumber 4 3 2 1 Data Status0 OFF OFF OFF OFF 0x300 0x3021 OFF OFF OFF ON 0x304 0x3062 OFF OFF ON OFF 0x308 0x30A3 OFF OFF ON ON 0x30C 0x30E4 OFF ON OFF OFF 0x310 0x3125 OFF ON OFF ON 0x314 0x3166 OFF ON ON OFF 0x318 0x31A7 OFF ON ON ON 0x31C 0x31E8-14 RESERVED15 ON ON ON ON Flash Bypass ModeTable 1.2 ACR2000 PC BUS Port Addresses