| Linux-GPIB 4.3.6 Documentation | ||
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Changes various configuration settings associated with the board or device descriptor ud. The option argument specifies the particular setting you wish to modify. The setting argument specifies the option's new configuration. To query the descriptor's configuration, see ibask().
Table 1. ibconfig options
| option | value (hexadecimal) | effect | used for board/device |
|---|---|---|---|
| IbcPAD | 0x1 | Sets GPIB primary address. Same as ibpad() | board or device |
| IbcSAD | 0x2 | Sets GPIB secondary address. Same as ibsad() | board or device |
| IbcTMO | 0x3 | Sets timeout for io operations. Same as ibmto(). | board or device |
| IbcEOT | 0x4 | If setting is nonzero, EOI is asserted with last byte on writes. Same as ibeot(). | |
| IbcPPC | 0x5 | Sets parallel poll configuration. Same as ibppc(). | board |
| IbcREADDR | 0x6 | Useless, included for compatibility only. | device |
| IbcAUTOPOLL | 0x7 | If setting is nonzero then automatic serial polling is enabled. | board |
| IbcCICPROT | 0x8 | Useless, included for compatibility only. | board |
| IbcSC | 0xa | If setting is nonzero, board becomes system controller. Same as ibrsc(). | board |
| IbcSRE | 0xb | If setting is nonzero then board asserts REN line. Otherwise REN is unasserted. Same as ibsre(). | board |
| IbcEOSrd | 0xc | If setting is nonzero then reads are terminated on reception of the end-of-string character. See ibeos(), in particular the REOS bit. | board or device |
| IbcEOSwrt | 0xd | If setting is nonzero then EOI is asserted whenever the end-of-string character is sent. See ibeos(), in particular the XEOS bit. | board or device |
| IbcEOScmp | 0xe | If setting is nonzero then all 8 bits are used to match the end-of-string character. Otherwise only the least significant 7 bits are used. See ibeos(), in particular the BIN bit. | board or device |
| IbcEOSchar | 0xf | Sets the end-of-string byte. See ibeos(). | board or device |
| IbcPP2 | 0x10 | If setting is nonzero then the board is put into local parallel poll configure mode (IEEE 488.1 PP2 subset), and will not change its parallel poll configuration in response to receiving 'parallel poll enable' command bytes from the controller-in-charge. Instead, the parallel poll configuration is set locally by doing a board-level call of ibppc(). A zero value puts the board in remote parallel poll configure mode (IEEE 488.1 PP1 subset). IEEE 488.2 requires devices to support the remote PP1 subset and not the local PP2 subset. Some older hardware does not support local parallel poll configure mode. | board |
| IbcTIMING | 0x11 | Sets the T1 delay. Use setting of 1 for 2 microseconds, 2 for 500 nanoseconds, or 3 for 350 nanoseconds. These values are declared in the header files as the constants T1_DELAY_2000ns, T1_DELAY_500ns, and T1_DELAY_350ns. A 2 microsecond T1 delay is safest, but will limit maximum transfer speeds to a few hundred kilobytes per second. | board |
| IbcReadAdjust | 0x13 | If setting is nonzero then byte pairs are automatically swapped during reads. Presently, this feature is unimplemented. | board or device |
| IbcWriteAdjust | 0x14 | If setting is nonzero then byte pairs are automatically swapped during writes. Presently, this feature is unimplemented. | board or device |
| IbcEventQueue | 0x15 | If setting is nonzero then the event queue is enabled. The event queue is disabled by default. | board |
| IbcSPollBit | 0x16 | If the setting is nonzero then the use of the SPOLL bit in ibsta is enabled. | board |
| IbcSendLLO | 0x17 | If the setting is nonzero then devices connected to this board are automatically put into local lockout mode when brought online with ibfind() or ibdev(). | board |
| IbcSPollTime | 0x18 | Sets timeout for serial polls. The setting must be between 0 and 17, which correspond to the same time periods as in ibtmo(). | device |
| IbcPPollTime | 0x19 | Sets timeout for parallel polls. The setting must be between 0 and 17, which correspond to the same time periods as in ibtmo(). | board |
| IbcEndBitIsNormal | 0x1a | If setting is nonzero then the END bit of ibsta is set on reception of the end-of-string character or EOI (default). Otherwise END bit is only set on EOI. | board or device |
| IbcUnAddr | 0x1b | If setting is nonzero then UNT (untalk) and UNL (unlisten) commands are automatically sent after a completed io operation using this descriptor. This option is off by default. | device |
| IbcHSCableLength | 0x1f | Configures the total cable length in meters for your system, by sending the command bytes CFE and CFGn. This is required to enable high speed noninterlocked handshaking (a.k.a. HS488) and set associated handshake timings. Valid setting values are 0 through 15. A value of zero disables noninterlocked handshaking, otherwise the value is the total number of meters of cable. | board |
| IbcIst | 0x20 | Sets the individual status bit, a.k.a. 'ist'. Same as ibist(). | board |
| IbcRsv | 0x21 | Sets the current status byte this board will use to respond to serial polls. Same as ibrsv(). | board |
| IbcBNA | 0x200 | Changes the GPIB interface board used to access a device. The setting specifies the board index of the new access board. This configuration option is similar to ibbna() except the new board is specified by its board index instead of a name. | device |
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