SD-160 Series Data Radio

Two-Tone Squelch(SQ) SystemThe radios will support Motorola-Format, Two-Tone(Type 99) decoding. This is receive only,decode only feature. It will allow a dispatcher to call individuals and groups. EachSystem/Group will be programmable to respond to any combination of the code, with adistinctive alert for each System/Group. The alert format consists of two tone sequences, firstthe ID of the radio being called, then the ID of the calling radio.This feature is programmed by the dealer(per customer’s request) and is not activated /deactivated by the user. The user interface consists of the radio emitting the tones beingbroadcast. At this point, the radio will enter Unmuted Rx mode and remain in this mode until thePTT signal is inputted.Serial commandTo give the simplest protocol for control of radio, Maxon has prepared for some serialcommands which have an ease to encode and decode format. SD-160 can be used withoutserial commands, but user can use its various functions through application of those, forinstance, setting-up the basic radio operation such as channel change, switch of RX/TX andchannel scan, moreover, used for control of GPS and modem option board. All messages are inbinary format, which reduces required data size to shorten response time of radio and followsbelow data format.Serial RX/TX Data Format(1) Asynchronous Serial Data Transfer(2) Baud Rate : 4,800 bit/sec(3) Data Bit : 8bit , Non Parity(4) Stop Bit : 1bit(5) MSB first transmissionEach serial command is consist of 3 bytes. 1 st byte is command and 2 nd is data required bycommand and 3 rd is check sum to decide validity of total contents.Byte0ST 1 st Byte (Command) SPByte1ST 2 nd Byte (Data) SPByte2ST 3 rd Byte (Check Sum) SP16