I'm designing a GPIB device and use the NAT9914-IC with the 75160/75162 - Transceivers.
For this I read the Application Note 110, the Reference Manual and the Product Manual. During the initalization I do following steps:
gpib_write(R_AUXMR, 0x15); //switch to 9914-Mode
gpib_write(R_AUXCR, 0x1c); //reset
gpib_write(R_AUXCR, 0x80); //reset-mode
gpib_write(R_AUXCR, 0x9f); //page-in ACCR
gpib_write(R_ACCR, 0x28); //ICR <- 16MHz
gpib_write(R_AUXCR, 0x99); //switch to 7210-Mode
gpib_write(R_AUXMR, 0x50); //page-in
gpib_write(R_ICR2, 0x81); //SET MICR-Bit
gpib_write(R_AUXMR, 0x15); //switch to 9914-Mode
gpib_write(R_ADR, adr); //Addresse setzen
_delay_ms(10);
gpib_write(R_SPMR, 0xaa); //serial poll response
gpib_write(R_PPR, 0x00); //parallel poll rsponse
gpib_write(R_AUXCR, 0x15); //stdl
gpib_write(R_AUXCR, 0x17); //vstdl
gpib_write(R_IMR0, 0x3f);
gpib_write(R_IMR1, 0xff);
gpib_write(R_AUXCR, 0x1e); //page-in IMR2
gpib_write(R_IMR2, 0x00); //GLINT-BIT löschen
gpib_write(R_AUXCR, 0x9e); //page-in EOS
gpib_write(R_EOSR, 0x0a); //LF als letztes Zeichen
gpib_write(R_AUXCR, 0x9f); //Page-in ACCR
gpib_write(R_ACCR, 0x8c); //EOS-Art (EOI+EOS)
gpib_write(R_AUXCR, 0x00); //Clear Reset
I use the Tektronix Open Choice Instrument Manager as a GPIB-Scanner but my device isn't shown there and the NAT9914 doesn't react. The CPTR-Register shows the Bytes right that are sended by the InstrumentManager. The BSR-Register shows that ATN and NDAV are asserted and the ADSR has also the ATN-Bit active, but not the LA-Bit that signifies, that the Controller defines it as Listener (when I understand everything right).
The Sequence that is send by the Scanner is:
0x3f (UNL) - 0x40 (MTA0) - 0x20 (MLA0)
0x3f (UNL) - 0x40 (MTA0) - 0x20 (MLA0) - 0x60 (MSA0) ... 0x7e (MSA30)
0x3f (UNL) - 0x40 (MTA0) - 0x21 (MLA0)
0x3f (UNL) - 0x40 (MTA0) - 0x21 (MLA0) - 0x60 (MSA0) ... 0x7e (MSA30)
...
0x3f (UNL) - 0x40 (MTA0) - 0x3e (MLA0)
0x3f (UNL) - 0x40 (MTA0) - 0x3e (MLA0) - 0x60 (MSA0) ... 0x7e (MSA30)
Why doesn't the Nat9914 react in that way I want?
I need Help!
