Ricoh A230, Service Manual, Page: 790 / 1134

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NCU PARAMETERS
4-65
SM A230/A231/A232
Address Function Unit Remarks
480433 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).
Bits 7 and 6 – number of cycles required for cadence detection in tx
Bit 7 6
0 0 2 times
0 1 3 times
1 0 4 times
1 1 5 times
Bits 5 and 4 - number of cycles required for cadence detection in rx
Bit 5 4
0 0 2 times
0 1 3 times
1 0 4 times
1 1 5 times
Bits 3 and 2 - Not used. Keep these bits at 0.
Bits 1 and 0 - Tolerance (
±
)
Bit 1 0
0 0 75%
0 1 50%
1 0 25%
1 1 12.5%
480434 International dial tone frequency
upper limit (high byte) Hz (BCD)
480435 International dial tone frequency
upper limit (low byte)
If both addresses
contain FF(F), tone
detection is disabled.
480436 International dial tone frequency
lower limit (high byte) Hz (BCD)
480437 International dial tone frequency
lower limit (low byte)
480438 International dial tone detection
time 20 ms
480439 International dial tone reset time
(LOW) 20 ms
48043A International dial tone reset time
(HIGH) 20 ms
48043B International dial tone continuous
tone time 20 ms
48043C International dial tone permissible
drop time 20 ms
48043D International dial wait interval
(HIGH) 20 ms
48043E International dial wait interval
(LOW) 20 ms
If 480438 contains FF,
the machine pauses for
the pause time (48043D
/ 48043E).
See Note 2 (Belgium).
48043F Country dial tone upper frequency
limit (HIGH) Hz (BCD)
480440 Country dial tone upper frequency
limit (LOW)
If both addresses
contain FF(F), tone
detection is disabled.