Spectra 1728 - PART 8: REPORTING AND DIALER SETTINGS; 8.1 REPORTING;DIALER (ENABLE;DISABLE); 8.2 REPORT CODES

Spectra 1728/EX & 1738/EX - 33 - Programming Guide
4-OUTPUT BUS MODULE (APR3-PGM4)
4-ZONE EXPANSION BUS MODULE (SPC-ZX4 AND APR3-ZX4)