$$GENERAL INFORMATION
##Port Selection
###When the ST-25 Program Manager is started, a port designation augment may be
added to the command line. (C:\Select.one\ST25.exe /1) directs the Program
Manager to use comm port #1. When an augment is not specified Comm 2 is selected
as default. 
##Password Entry
###When the ST25 Program Manager is started the first screen displayed calls for
entry of a password. The password is a four character sequence using alphabetic
or numeric characters available on the PC keyboard. This password becomes the
Active Password for this session of Program Manager. The Active Password is
passed to the ST-025 prior to EVERY programming or read attempt. The ST-025B/C
compares the Active Password with the password maintained Resident in the 
ST-025B/C EEPROM. If the Active and Resident Passwords do not match, the 
ST-025B/C will not accept programming or permit a read. If a read or program
attempt is made and the Active and Resident Passwords do not match, an
opportunity is offered to change the Active Password. The Active Password
may also be changed by exiting Program Manager and re-entering using a new
password. 
As shipped from the factory the Resident Password in all ST-025B/C's is "ST25".
Refer to the Change ST-25 Password for information on how to change the
Resident Password maintained in the ST-025B/C EEPROM. The Resident password is
stored in an encrypted form in the ST-025B/C EEPROM and is NOT readable. 
$$CONFIGURATION
##Operating Mode (Selection)
###The ST-025B is capable of operation in Ciphered or Clear (non-ciphered)
modes. Switching between Clear and Ciphered operation is automatic during radio
reception. For transmit it is necessary to select the desired mode with the
Clear/Ciphered line. To accommodate the specifics of individual host radios, the
method used to switch between Clear and Ciphered operation is selected here. 
[Switch]  This is the factory default mode. A toggle switch or other
mechanically latching switch is used for switching between Clear and Ciphered.
The Clear/Ciphered line is pulled up to 5Vdc by a resistor internal to the ST
025B uP. Open circuit or (5Vdc) results in Clear (non-ciphered) transmit
operation.
[Double Click] Many modern radios are physically small and do not have space to
add a toggle switch or any additional controls. When configured for Double
Click, the ST-025B can use almost any existing momentary switch on the host
radio to select the transmit operation mode. The Clear/Ciphered line is pulled
up to 5Vdc by a resistor internal to the ST-025B uP. This line responds to rapid
transitions "Double Clicks". The resting condition of the Clear/Ciphered line
may be open (5Vdc) or low (connection to (-)Supply). Two clicks switches between
clear and ciphered or ciphered and clear. Four clicks accommodates switching
between User Code keys. The resulting condition following the clicks is
annunciated with beeps to the radio speaker. A long low beep indicated Clear Tx
operation. short high beeps indicate ciphered and the User Code Key selected.
##Power-Up Mode
###When the ST-025B is configured for Double Click the Clear/Ciphered transmit
mode is not controlled by a hard switch function. This parameter permits
selection of the Clear/Ciphered transmit mode the radio will enter immediately
following power-up. 
##LED Operation
###The Spk Beep/LED/RS232 lead can be used to provide a visual indication that
the radio is transmitting or receiving a ciphered signal. When the this
parameter is "ON", +5Vdc will be provided on this lead during ciphered transmit
or receive. If an LED is used a series resistor will be required to limit the
LED current.This function is NOT usable with Transmit Alert.
##Transmit Alert
###All radio systems have some system delay between the time the originating
operator presses the PTT button and audio is actually available at the speaker
of the receiving station. The ST-025B sends a digital synchronisation signal at
the beginning of each transmission (aprox. 100mS duration). This synchronisation
signal must be received in its entirety by the receiving station to enable
ciphered reception. 
It is often difficult for radio operators to press the PTT then wait for the
required system delay + synchronisation time (+100mS). When transmit alert is
enabled the ST-025B will beep the speaker to Alert the radio operator that all
systems delays have been completed and it is OK to speak.
##Transmit Delay
### All radio systems have some system delay between the time the originating
operator presses the PTT button and audio is actually available at the speaker
of the receiving station. The ST-025B sends a digital synchronisation signal at
that contains NO ENCRYPTION INFORMATION at the beginning of each transmission
(aprox. 100mS duration). This synchronisation signal must be received in its
entirety by the receiving station to enable ciphered reception. 
The Transmit Delay parameter delays the sending of the initial synchronisation
signal to accommodate system delays. This parameter is adjusted in 100mS steps
from 50mS to 1550mS. An entry of 0 produces no transmit delay.
$$PRODUCT INFORMATION
##Continuously displays the product information for the attached ST-025B
###This information may be requested by the Selectone Tech Support personal
should service be required.
$$USER CODE KEYS
##Encryption Algorithm
###The ST-025 encryption algorithm produces over 1 trillion different code keys.
Any ST-025B/C has access to over 260 million of these keys. 
All versions of the ST-025 (ST-025A, ST-025B, ST-025AGP...) are compatible with
each other. However the original sales order number needs to be confirmed, so
new orders will communicate with previous purchases. The factory programmed
Master Code Key is unique and must match between units to make User Code Keys
compatible. 
The user of a radio equipped with an ST-025 has easy access to four previously
selected code keys. These four code keys are referred to User Code Keys.
##Usable characters
###Any of the following characters may be use in a User Code Key.
0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F.
##User Code Key #1
###Selected when Code Select Lines 1 and 2 are both open circuit or 5Vdc.
Annunciated with one beep when entering ciphered transmit mode via double click
operation. This parameter must be 7 characters in length using any of Usable
characters in any of the 7 positions.
##User Code Key #2
###Selected when Code Select line 1 is connected to (-) Supply, and Code Select
Line 2 is open circuit or 5Vdc. Annunciated with two beeps when entering
ciphered transmit mode via double click operation. This parameter must be 7
characters in length using any of Usable characters in any of the 7 positions.
##User Code Key #3
###Selected when Code Select Line 1 is open circuit or 5Vdc, and Code Select
Line 2 is connected to (-) Supply. Annunciated with three beeps when entering
ciphered transmit mode via double click operation. This parameter must be 7
characters in length using any of Usable characters in any of the 7 positions.
##User Code Key #4
###Selected when Code Select lines 1 and 2 are both held low (-)Supply.
Annunciated with four beeps when entering ciphered transmit mode via double
click operation. This parameter must be 7 characters in length using any of
Usable characters in any of the 7 positions.
$$PROGRAMMING
##Program On Comm x
###Press this button to program the connected ST-025B/C with the parameters
displayed. Parameters that have been changed and are awaiting programming are
high lighted in Red. The Red high lighting is removed after this button has been
pressed. 
Comm x indicated the PC Comm port used for programming. When the ST-25 Program
Manager is launched, a port designation augment may be added to the command
line(C:\Select.one\ST25.exe /1) directs the Program Manager to use comm port #1.
When an augment is not specified Comm 2 is selected as default. 
##Read
###Caused the ST-25 Program Manager to read the connected ST-025B/C, using the
comm port indicated in the program button.
##Change ST-025 Password
### When the ST25 Program Manager is started the first screen displayed calls
for entry of a password. The password is a four character sequence using
alphabetic or numeric characters available on the PC keyboard This password
becomes the Active Password for this session of Program Manager. The Active
Password is passed to the ST-025B/C prior to EVERY programming or read attempt.
The ST-025B/C compares the Active Password with the password maintained Resident
in the ST-025B/C EEPROM. If the Active and Resident Passwords do not match, the 
ST-025B/C will not accept programming or permit a read. 
As shipped from the factory the Resident Password in all ST-025B/C's is "ST025".
This feature is used to change the Resident Password maintained in the ST-025B/C
EEPROM memory. The prompt screen requires entry and verification. If the entry
and verification match, and OK is pressed the new password programmed and
becomes the new Resident Password. 
If a Active/Resident Password match has occurred (due to a Read or Program
transaction)during this power up of the ST-025B/C, the New Resident Password is
encrypted and stored in EEPROM memory.
If a Active/Resident Password match has NOT occurred (due to a Read or Program
transaction)during this power up of the ST-025B/C, the New Resident Password is
encrypted and stored in EEPROM memory and for security the User Code Keys are
all set to 0000000. 
##Restore Factory Defaults
###Press this button to restore factory default values to all parameters stored in the ST-025B/C EEPROM, except the Resident Password and Master Code Key.
##Help
###Press this button to access Help screens.
NOTE: ST25.hlp is a text file used to store this help information. Corrections
and updates are available at no charge off the Selectone web site at
www.selectone.com.
##QUIT
###Press this button to exit the ST-025B/C Program Manager.