Brief Introduction to The CM1481
The CM1481 is a compact 5- or 6-Tone CCIR, EEA
and ZVEI selcall module with individual address
encoding, non-predictive all-tone decoding,
transponding and full, all-system GROUP Call and ANI
capabilities.
‘Stun’, ‘Release’ and ‘Re-Configuration’ operations
are carried out using a secure authentication protocol
to prevent accidental or illegal transactions.
The unit may be muted by the base.
Under the control of its on-board µController,
operating from instructions written to it by a simple
menu-driven configuration operation from a basic 'PC'
type computer, the CM1481 can completely control
the workings of the radio's Rx and Tx audio
processes.
In addition to normal selcall facilities, the CM1481
offers, as standard, a range of over-air control facilities
to allow a base-station additional control when working
with remote units.
These added facilities are:
‘Stun’ and ‘Release’ - To allow the controller to
completely ‘freeze’ all module and parent radio audio
functions rendering it inoperative until ‘Released’. This
to counter theft, air misuse/abuse or non-payment of
fees.
After Configuration the only operator inputs
required are Microphone/Handset, Volume and Selcall
Tx/Mute controls.
The CM1481 will detect and decode all incoming
tone information, controlling the radio functions whilst
providing the operator with various coded audio alerts
to indicate status and progress.
‘Re-Configuration’ - To change module addresses
and modes via an over-air command. This to allow
unit participation in other user groups.
13
J1/
CM1481
D
+
-
1
J1/
U1
+
U3
X1
U4
Configuration Interface Connector
U2
TCH
WI
S
O
-AUDI
IN
OUT
Fig.1 A Typical Configuration Setup
CM1481 - A Summary of Standard Functions and Features
Configuration by Menu-Driven
Software via a Serial ‘PC’ Link
Individual Addressing
Identification (ANI)
Extended Group & Data Tone
Facilities
Programmable Lead-In Tone
and Delay
CCIR, EEA and ZVEI
Toneset/Length Capabilities
Simple Radio Interface
Transponding Facility
HSC Signalling Control Features
Over-Air “Stun” & “Release”
Low-Power Requirement
(4.0mA typ)
Single or Dual Button Operation
Timed Mute Reset
Rapid Over-Air “Re-
Configuration”
“Muted” Call Initiation
Tx (PTT) Time Out + Warning
PTT (Busy) Lockout
Programmable I/O Polarities
Lead/Trail Automatic Number
Remote Reset
CMOS Compatible Logic
Operators' Coded Call-Alert
Capability
3
CMLMICRO [ CML MICROCIRCUITS ]
