Ricoh FAX500, Service Manual

Page: 52 / 90

4.3. NCU PARAMETERS
The following tables give the RAM addresses and units of calculation of the
parameters that the machine uses for ringing signal detection and automatic
dialing. The factory settings are also given. Most of these must be changed
by RAM read/write (Function 95), but some can be changed using NCU Pa-
rameter programming (Function 96); if Function 96 can be used, this will be
indicated in the Remarks column. The RAM is programmed in hex code un-
less (BCD) is included in the Unit column.
When using RAM read/write, you must add the bank number before the four-
digit RAM address number. See section 4-1-6 for details.
Address Function Unit Remarks
413B Country code (NCU parameters
only) Hex Function 96 (parameter 00).
413C Line current detection time 20 ms Line current is not detected
if 413C contains FF.
413D Line current wait time
413E Line current drop detect time
413F PSTN dial tone upper frequency
limit (HIGH) Hz (BCD) See Note 2.
4140 PSTN dial tone upper frequency
limit (LOW)
4141 PSTN dial tone lower frequency
limit (HIGH)
4142 PSTN dial tone lower frequency
limit (LOW)
4143 PSTN dial tone detection time 20 ms If 4143 contains FF, the
machine pauses for the
pause time (4147).
4144 PSTN dial tone reset time 160 ms
4145 PSTN dial tone continuous tone
time 20 ms
4146 PSTN dial tone permissible drop
time
4147 PSTN wait interval 160 ms
4148 Ringback tone detection time 20 ms Detection is disabled if this
contains FF.
4149 PSTN busy tone upper frequency
limit (HIGH) Hz (BCD) If 4149 is FF, detection is
disabled. See Note 2.
414A PSTN busy tone upper frequency
limit (LOW)
414B PSTN busy tone lower frequency
limit (HIGH)
414C PSTN busy tone lower frequency
limit (LOW)
November 30th, 1991 SERVICE TABLES AND PROCEDURES
NCU PARAMETERS
4-20