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The ST-888 ANI Decoder/Display Unit is a key component of the Selectone Mobilecall™ ANI (Automatic Number Identification) System, which provides instant identification of a transmitting mobile or station unit in a two way radio system. Applications include remote status monitoring and control systems, taxi systems, police and public safety, courier services, and other fleet dispatch systems where positive identification of the mobile unit is desired to reduce channel time, to identify system abusers, or to provide a permanent record of fleet activity. The popular Selectone Mobilecall ANI System is in daily use throughout the world in over 3,000 fleets with over 75,000 mobile and portable radios.
The ST-888 Decoder/Display is typically connected to the base radio at the dispatcher’s location to provide a visual display of the identity of each transmitting mobile unit. The ST-888 is compatible with the industry-standard DTMF (Touch-Tone®) signalling format. Therefore, each mobile unit must have a DTMF ANI signalling option, or be equipped with the Selectone ST-804A ANI/ENI Encoder, or similar ANI encoder module.
The ST-888 is an attractive desk top console measuring 8.0" W x 4.3" D x 1.7" H and operates on 13.6 VDC or 117 VAC with wall mount adapter. The ST-888 includes a real-time clock and calendar, eight code memory recall stack, Centronics parallel port for printer interface, and a RS-232C serial port for interface to a terminal, serial printer, or computer.
- Compact Size — attractive console measures only 8.0" W x 4.3" D x 1.7" H.
- Code Validation — internal validation check accepts only valid code sequences.
- Variable Data Rate — accepts incoming digits from 1 to 20 dps to accommodate both manual and automatic encoders.
- Internal Clock and Calendar — to print out time and date of each transmission (with optional ST-824 printer).
- ENI Compatible — provides audible internal alarm and external alarm output upon receipt of ENI (Emergency Number Identification) code.
- Two Output Ports — for easy connection to a computer and external printer.
- Internal Memory Stack — allows dispatcher to scroll through the last eight ANI codes received.
When the ST-888 receives an ANI code from a mobile unit, it decodes the DTMF code sequence and displays it as the sending unit’s identification number. An internal sounder will sound momentarily. The ANI display will remain for five seconds, or until the next ANI code is received.
ANI code sequences may be from one to eight digits in length. A validation check is performed by the ST-888 to determine that an incoming code has the correct prefix digit, the correct number of digits, and is received at the proper speed (data rate). If these three conditions are not met, the code will be rejected as invalid and will not be displayed.
When equipped with a printer such as the Selectone ST-824, the ST-888 will provide a printed record of each incoming ANI code, along with the time and date of receipt. A terminal or computer may also be interfaced with the ST-888 via the RS-232C serial port to provide expanded display capabilities.
The ST-888 also has provision for receiving a special ENI (Emergency Number Identification) code from a mobile unit. Receipt of a emergency code will energize an internal sounder and latch an external alarm output until the unit is manually reset. The ENI feature is also useful in remote status monitoring applications to alert a central station of a critical change in oil pressure, water levels, etc., at a remote site.
The ST-824 is a compact, thermal printer, which connects to the serial port of the ST-888 with the supplied 6 foot cable assembly. Printed output is supplied on standard 8.5"X98' thermal paper. Extra paper is available at most office supply stores.
Like most Selectone products, all operating parameters of the ST-888 are PC programmable using the Selectone Product Manager software. The ST-888PM Product Manager is available in both Windows and DOS versions and may be ordered from the factory or downloaded from the Selectone Website by clicking here.
ST-888 OPERATING SPECIFICATIONS SPECIFICATION DETAIL Operating Voltage 13.6 Vdc ±20% Operating Current 150mAdc at all operating voltages Signaling Format DTMF (16 available characters) Sequence Length ANI or ENI prefix plus 1 to 8 ID digits Signaling Input Level 30mVrms to 2.5Vrms (composite) Twist Acceptance -8 to +4 dB if lesser tone is >30mVrms Noise Tolerance -12dB referenced to lower amplitude tone Decode Bandwidth +2.3% of nominal DTMF frequency Signaling Input Impedance >50K balanced Digit Rate Manual
0.5 to 10 Digits/Sec. 80mS min. tone on time 5 Digits/Sec.
4 to 10 Digits/Sec. 80mS min. tone on time 10 Digits/Sec.
8 to 16 Digits/Sec. 45mS min. tone on time 15 Digits/Sec.
11 to 20 Digits/Sec. 30mS min. tone on time 20 Digits/Sec.
14 to 22 Digits/Sec. 25mS min. tone on time Speaker Mute Form C Relay energizes on receipt of DTMF Alarm Output Open collector Serial Port Standard RSS 232 C configured for DCE Serial Baud Rate 1200 baud, 8 bits, 1 stop bit, no parity Dimensions 8.0"W x 4.3"D x 1.7"H
(20.32cm x 10.92cm x 4.32cm)Specifications and descriptions subject to change without notice
© 1999, Communications Specialists, Inc. All rights reserved.
Revision 4/14/99
Last updated May 28, 2003