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/* turn channel 1 20 dB post attenuator on */
/* read bit 35 by reading the A/D status register */
case 35:IOOUTPUTS(CMD_MOD, stat_read, strlen(stat_read));
IOENTER(CMD_MOD, &bit);
/* set bit 35 to ’0’ by writing to the A/D serial register */
sprintf(stat_write,"DIAG:POKE %ld, %d, %d", base_addr+0x05,8,0);
IOOUTPUTS(CMD_MOD, stat_write, strlen(stat_write));
break;
/* turn channel 1 20 dB input attenuator off */
/* read bit 34 by reading the A/D status register */
case 34:IOOUTPUTS(CMD_MOD, stat_read, strlen(stat_read));
IOENTER(CMD_MOD, &bit);
/* set bit 34 to ’1’ by writing to the A/D serial register */
sprintf(stat_write,"DIAG:POKE %ld, %d, %d", base_addr+0x05,8,1);
IOOUTPUTS(CMD_MOD, stat_write, strlen(stat_write));
break;
/* route input signal to channel 1 attenuators */
/* read bit 10 by reading the A/D status register */
case 10:IOOUTPUTS(CMD_MOD, stat_read, strlen(stat_read));
IOENTER(CMD_MOD, &bit);
/* set bit 10 to ’1’ by writing to the A/D serial register */
sprintf(stat_write,"DIAG:POKE %ld, %d, %d", base_addr+0x05,8,1);
IOOUTPUTS(CMD_MOD, stat_write, strlen(stat_write));
break;
/* read and shift all other shift register bits to restore each bit */
/* to its original position */
default:IOOUTPUTS(CMD_MOD, stat_read, strlen(stat_read));
IOENTER(CMD_MOD, &bit);
bit_set = (int)(bit + ((bit >= 0) ? .5 : -.5));
sprintf(stat_write,"DIAG:POKE %ld, %d, %d", base_addr+0x05,8,bit_set);
IOOUTPUTS(CMD_MOD, stat_write, strlen(stat_write));
break;
}
}
Continued on Next Page
Appendix C Register Programming 393