Comtrol QNX 4.xx User Manual

Page 3

• Starts Dev32.rckt for any number of RocketPort PCI

cards at 115200 baud.

Dev32.rckt -b 115200 &

Resolving Installation Problems

If installation fails or you are trying to resolve a

problem, you should try the following before calling the

Comtrol technical support line:
• Check the signals between your peripherals and the

interface box to verify that they match (if applicable).

See the appropriate Hardware Reference Card for

information.

• Check to make sure the cables are connected

properly.

• Reseat the card in the slot.
• Make sure that the expansion slot screw was

replaced after inserting the card.

• Check for possible I/O address conflicts using the

following table.

If you have not been able to get the card operating:
1. Turn off your PC and insert the diagnostic diskette.
2. Boot the PC and following the instructions provided

by the diagnostic diskette.

Software Sample Code

The QNX system calls: open, close, works for opening

and closing ports, and tcsetattr sets the stty settings

for the port.
System calls: read and write also work. These are the

same calls that you would use for standard ports. There

are no special calls needed for the RocketPort, it is

treated and manipulated similar to standard ports.
Please refer to your QNX manuals for information about

QNX function calls or locate the QNX web page where

they have free sample software:

http://www.qnx.com.

Software & Hardware Buffers

The RocketPort card has a 1,024 byte hardware queue

for input data, and a 256 byte hardware queue for

output data. This is on a per port basis.
The 1K byte input queue buffer is adequate and works

well in most cases. The hardware performs RTS/CTS

flow control. The output buffer is smaller and might be a

problem for some programs.
An additional software buffer on the output helps ease

this problem. (The QNX driver employs a 2K

intermediate buffer). Software buffers do have a cost,

you pay a penalty of an increase in RAM required by the

driver as well as additional overhead required to shuffle

data in and out of it. Also, the addition of a software

buffer requires polling in order to move data from the

software buffer to the hardware buffer. This requires

either a dedicated IRQ or a hook into the system timer.

(The QNX driver responds to a Transmit Buffer Empty

(TBE) interrupt so no polling is required for continuous

transmission).

Technical Support

Before you place a technical support call to Comtrol,

please make sure that you have the following

information.
• Card type
• Connector type
• I/O address selections
• OS type and release
• Driver release number (to verify, enter sin ver)
• PC make, model, & speed
• List of other devices in the

with addresses

After you have gathered this information, contact

Comtrol using one of the following methods.
Comtrol Headquarters
Phone: (612) 631-7654

FAX: (612) 631-8117

Email: [email protected]

Web site: http://www.comtrol.com

FTP site: ftp.comtrol.com

telnet: www.comtrol.com (or telnet 204.73.219.7)

Comtrol Europe
Phone: +44 (0)1869 323220

FAX: +44 (0)1869 323211

Email: [email protected]

Web site: http://www.comtrol.co.uk

Copyrights and Trademarks

First Edition, March 26, 1998

warranties with regard to the contents of this reference

card or to the suitability of Comtrol products for any

particular purpose.
Comtrol and RocketPort are trademarks of Comtrol

Corporation. QNX is a registered trademark of QNX

Software Systems, LTD.
Other product and company names mentioned herein

may be the trademarks of their respective owners.

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