hpib_card_ppoll_resp(3I) — Series 300, 400, 800 Only

NAME

hpib_card_ppoll_resp() − control response to parallel poll on HP-IB

SYNOPSIS

#include <dvio.h>

int hpib_card_ppoll_resp(int eid, int flag);

DESCRIPTION

hpib_card_ppoll_resp() enables or disables an interface for parallel polls. It also controls the sense, and determines the line on which the response is sent. This provides a means for the interface to ignore or respond to a parallel poll according to whether it is enabled to respond.

eid is an entity identifier of an open HP-IB raw bus device file obtained from an open(), dup(), fcntl(), or creat() call. flag is an integer having one of the following bit patterns:

Bit Pattern Meaning

10000 Disable parallel poll response.

0SPPP Enable parallel poll response, where

S = sense of the response, and

PPP = 3-bit binary number specifying the line on which the response is sent where the octal values 0 through 7 correspond to lines DIO1 through DIO8.

RETURN VALUE

hpib_card_ppoll_resp() returns 0 (zero) if successful, or −1 if an error was encountered.

ERRORS

hpib_card_ppoll_resp() fails under the following circumstances, and sets errno (see errno(2)) to the value in square brackets:

[EACCES] The interface associated with this eid is locked by another process and O_NDELAY is set for this eid (see io_lock(3I)).

[EBADF] eid does not refer to an open file.

[ENOTTY] eid does not refer to an HP-IB raw bus device file.

[EINVAL] the device cannot respond on the line number specified by flag.

[ETIMEDOUT] a timeout occurred.

DEPENDENCIES

Series 300/400:

The HP 98625A/B and HP 25560A HP-IB interfaces support only enabling and disabling the parallel poll response (bit 4 of flag). The sense and response line number are not programmable on this card.

EIO is returned if a timeout occurs.

Series 800:

Since the sense and response line number are not programmable on the HP27110B HP-IB interface, the equivalent parallel poll configuration commands are sent over the HP-IB to the interface. Therefore, this function fails if the interface is not active controller.

AUTHOR

hpib_card_ppoll_resp() was developed by HP.

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