Ricoh A250 Service Manual page 518

NCU PARAMETERS
Address
680433 Busy tone signal state time tolerance for all ranges, and number of cycles
required for detection (a setting of 4 cycles means that ON-OFF-ON or OFF-
ON-OFF must be detected twice).
Tolerance (±)
Bit
Bits 7, 6, 5, 4 - number of cycles required for cadence detection
680434 International dial tone frequency
upper limit (high byte)
680435 International dial tone frequency
upper limit (low byte)
680436 International dial tone frequency
lower limit (high byte)
680437 International dial tone frequency
lower limit (low byte)
680438 International dial tone detection
time
680439 International dial tone reset time
(LOW)
68043A International dial tone reset time
(HIGH)
68043B International dial tone continuous
tone time
68043C International dial tone permissible
drop time
68043D International dial wait interval
(HIGH)
68043E International dial wait interval
(LOW)
68043F Country dial tone upper frequency
limit (HIGH)
680440 Country dial tone upper frequency
limit (LOW)
680441 Country dial tone lower frequency
limit (HIGH)
680442 Country dial tone lower frequency
limit (LOW)
A250
Function
1 0
0 0 75%
0 1 50%
1 0 25%
1 1 12.5%
Unit
Bits 2 and 3 must always
be kept at 0.
Hz (BCD)
Hz (BCD)
20 ms
Hz (BCD)
4-56
Remarks
If both addresses
contain FF(H), tone
detection is disabled.
If both addresses
contain FF(H), tone
detection is disabled.
If 680438 contains FF,
the machine pauses for
the pause time (68043D
/ 68043E).
Belgium: See Note 2.
If both addresses
contain FF(H), tone
detection is disabled.
If both addresses
contain FF(H), tone
detection is disabled.
SM