EMC EM91421 Series Manual page 11

LOCK function
The EM91421 series provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1
pin to VSS can select different LOCK control method that is conventional key lock or password lock. Also the
lock number that can be selected by connecting the resistors on COL2 or COL3 pin. After power on reset, the
password is fixed to 000 automatically. The lock function is disabled when the password is equal to 000 .
How to setup password
• Set LOCK function to password control mode. (Connects a resistor on COL1 pin to VSS)
• Off hook (or turn on HF function)
• Push : # , # , ops1 , ops2 , ops3 , nps1 , nps2 , nps3 , # . If the ops1~ops3 are the same with current password,
then nps1~np3 will be stored in the dialer to replace current password. Otherwise, the current password can
not be updated. All the numbers pressed in the password setup procedure can not be dialed out when current
password is not equal to 000. If the current password are equal to 000, then only the first number "#" will be
dialed out.
Normal dialing :
Set lock function to none lock mode (without resistor connected to COL1 pin) or set password equal to 000.
In this case, the dialer is operated in normal mode and all functions work at unlimitation.
Dialing via LOCK function
Conventional key lock mode. (Connects a resistor on COL1 pin to VDD)
• Off hook (or turn on HF function)
• Keying : d1 , d2 , .. , dn . If the first number (d1) is the same with the lock number that optioned in table,
then all entry numbers can not be dialed out and keyboard will be inhibited until on to off hook once again.
If the first number is not equal to lock number, all the entry numbers will be dialed out.
Password control mode. (Connects a resistor on COL1 pin to VSS)
• Off hook (or turn on HF function)
• Keying : ([ # , ps1 , ps2 , ps3 ] + telephone number.) The numbers in the [ ] symbol could be omitted. The
number "#" will be inhibited when the current password is not equal to 000,and ps1 , ps2 , ps3 work at the
checking state, not to be dialed out. Other descriptions are as on following :
◊ Incorrect password entry. The telephone numbers can not be dialed out.
◊ Password is omitted . If the first digit of telephone numbers is the same with the lock number, all of the
telephone numbers can not be dialed out and keyboard will be inhibited until On to Off hook once again.
If the first digit is not equal to the lock number then the telephone numbers will be dialed out entirely.
◊ Correct password entry. The telephone numbers can be dial out no matter what lock number is.
Ring detector
The Ring detector is designed to prevent illegal dialing from pocket dialer. Following the procedures ( i,ii,iii ),
this dialer will detect DRING pin to control RMUTE output level. If DRING is detected a "Low" level, the
RMUTE stays "High impedance". If DRING is detected a "High" level, the RMUTE will output "Low" until
* This specification are subject to be changed without notice.
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
EM91421 SERIES
10.1.1997
11