SC4x0 Technical manual
Page 28 of 34
SeaCom
Rev
2.00
hardware is possible without using a single instrument, it only require a speaker to be connected.
A scope or volt meter (in volt AC) can be used for tracing the signal path on the pcb.
11.3.1 Set Relay -command
The command ‘srly’ will display an option for select of relay. This option must be succeeded by the requested state
of the relay.
First type: ‘srly’ + Enter. To set hook relay on relay on type: ‘1 on’. To set off, type: ‘1 off’
11.3.2 To pass audio from microphone to speaker
The command ‘smic’ will prompt for the microphone to be used. First use ‘codec off’ to reset the audio processing
hardware. Write ‘codec pass’ to activate the audio processing. Audio is passed from microphone to line and from
line to speaker as default. Use the command ‘mirror on’ to pass from microphone to speaker and use ‘sspk’ to
select the speaker to pass to.
Gain can be adjusted by ‘sgts xx’ where xx in a number from 0 to 15. 11 are nominal 100% FSD, but when testing
values in the range of 1 to 6 should be used to prevent feedback.
NOTE: when testing the external speaker/loudhailer input/output, loudhailer relay must be set in correct position to
select speaker or mic.
11.4 Commands use full for development & testing
These commands should only be used by system developers as they may potentially cause the software to
malfunction and reset. In general only commands changing the contents of the eeprom cannot be recovered from
a reset. Meaning at reboot will reset all data to initial values, except data in eeprom, if changed.
11.4.1 Memory monitor & manipulation
These commands will display changes made to specified memory location or change specified location. The
command must be succeeded by a 32bit address identifier for monitoring and data as specified by the command if
written to memory. All info, both address and data must be written in hex values.
11.4.2 Eeprom data
All vital data in the eeprom is protected by a check sum and is duplicated. Data like call lists, memory dial are only
protected by a check sum. Erase of eeprom will reset entire eeprom. Recall factory settings will only preset all vital
data, but not call lists and memory dial. To erase these data, use bank erase to preserve all setup data.
To erase eeprom data, the state command must be issued having ‘prog’ as argument
11.4.3 Busy tone detector
The detector will look for tones of 350, 440 or 480 Hz having a cadence of 150ms ON, 250ms OFF or 240ms ON,
260ms OFF.
This will cover the SeaCom system, most standard busy tones and the Ericsson systems
