Bay Technical Associates 5218H, 528H, 529H, 525H owner manual

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Mode of Operation 6 provides time-division multiplexing. In this mode, the multiport continuously scans all peripheral ports to check for characters in the receive buffers. If a receive buffer contains data, the data is transmitted to the host device preceded by a port identification code corresponding to the peripheral port number from which the data block came. Transmission continues until the buffer is empty or until a user-specified data block length has been transmitted.

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A typical application using an H-Series multiport controller would have a host computer, such as an IBM PC, connected to the host port, and various peripheral devices (such as cash registers, digital laboratory instruments, bar code readers, numerical machines, printers, modems, terminals, etc.) connected to the peripheral ports.

Regardless of the mode of operation, the host device may connect and send data to a specific peripheral port by sending the control character and the desired peripheral port number followed by the data. The control character and peripheral port number are trapped and therefore not passed through to the selected peripheral port. For demonstration purposes, we will use the default control character, Control-T.

NOTE: The 8th bit or parity bit is masked from the control character before it is examined, allowing you to send the control character with odd or even parity. Therefore, when 8 data bits are being sent, only the first seven data bits are examined.

In modes of operation 2 through 5, each message sent to the host device is preceded by the port number of the peripheral port that received the message. This number may range from 1 to 4 on the 525H, 1 to 8 on the 528H and 529H, and 01 to 17 on the 5218H.

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Contents Series Multiport Controllers Page Copyright 1993 by Bay Technical Associates, Inc Table of Contents Federal Communications Commission Radio Frequency Page Page Below shows six applications, one for each mode of operation Factory POWER-UP Default Configurations USER-PROGRAMMABLE ConfigurationsUL and CSA Listed Page Page Page DCE Port Signals 500H Series DCE to DTE Device Page Factory default is Carriage Return 0D Hex Page Page Page Page Page Page Page Page Host-to-multiport-to-peripheral communication Peripheral-to-multiport-to-host communication Host-to-multiport-to-peripheral communication Peripheral-to-multiport-to-host communication Page Operation Protocol Enter Port Number 0=Exit,Return For 110 135 300 600 1200 2400 4800 9600 Enter request 0AH Section Control Mode of Operation Main Menu SET Message Terminate Character TITC22*233343526Y130A4250*51466X Page Page Page Solutions Problem Garbage Data Symptom Missing Characters Symptom Random Garbage Characters Problem Cant Select Peripheral Port from Host Device Problem Cant Receive Data from Peripheral Ports Ccitt DOS Page Page Page Uart Other Baytech Products Page Page Series Multiport Controllers Page
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