man8/group3task

Table of Contents

Description

I/O service for a Group3 system.

The program registers with dbman as "G3task".

Arguments

Argument processing is done using Unix long argument syntax.

--dbman_host <hn>: The host where dbman is running.
--drv <key>: Select the DrvKey to use when retrieving DATA records.
--dev <pn>: Which device to open. Valid devices presently are /dev/camac or /dev/group3. If nothing is specified /dev/camac is used.
--diag: If this argument is present stdin and stdout are are left open and the program may be killed by SIGINT.
--help: Print the help message to stderr and exit.

System initialization and database search and load

The initialization is complicated and needs to have detailed description written for it.

Configuration DrvKey and DevKey mapping

GRP3_1 maps to G3conf_1
GRP3_2 maps to G3conf_2
GRP3_3 maps to G3conf_3
GRP3_4 maps to G3conf_4
GRP3_5 maps to G3conf_5
GRP3_6 maps to G3conf_6

Group 3 Devices

C is the Group3 DI address.
N is the card number within a Group3 DI box.
ChNo is the channel number within a Group3 I/O card.

type A - fast analog and digital I/O board

Support is not completed for this board.

type B - 24 bit digital I/O board

This module requires one or two DATA records depending on the usage. The card has an open collector output with pullup resisters. The status of all lines on the card are monitored. Any line may be pulled low by an outside source or by asserting the appropriate bit in the output word.

Digital Input: ChNo 0 is used for digital inputs.
DATA.DTkey should be set to U.
Digital Output: ChNo 1 is used for digital outputs.
DATA.DTkey should be set to U.

type C - 8 input analog I/O board

ChNo should be in the range 0-7 where the channel number corresponds to the ADC channel.

DATA.DTkey should be set to U.

The data range is 0 to 64000 when the card is configured for unipolar operation.

The data range is -32000 to 32000 when the card is configured for bipolar operation.

This device has the property (using -10v -->10v as an example) that -32000 --> 32000 corresponds to -10v --> 10v. The actual binary range is -32768 --> 32768 (-10.24v --> 10.24v) rather than the expected range -32768 --> 32767 (-10.24 --> 10.23).

When adding parameters to the AccelNET database this should be taken into account and SpanMin and SpanMax should be set accordingly.

type D - 8 output analog I/O board

ChNo should be in the range 0-7 where the channel number corresponds to the ADC channel.

DATA.DTkey should be set to F.

The data range is 0 to 16000 when the card is configured for unipolar operation.

The data range is -8000 to 8000 when the card is configured for bipolar operation.

This device has the property (using -10v -->10v as an example) that -8000 --> 8000 corresponds to -10v --> 10v. The actual binary range is -8191 --> 8191 (-10.23875v --> 10.23875v) rather than the expected range -8192 --> 8191 (-10.24 --> 10.23).

When adding parameters to the AccelNET database this should be taken into account and SpanMin and SpanMax should be set accordingly.

This device has the peculiar problem that when sending bipolar values to it that it wants the binary value sign extended to 16 bits even though the manual says that it is a 14 bit device. That is why DATA.DTkey is set to F. It simply makes processing the data much easier.