Technical Manual

37
Mode Check
• Terminal mode: the device notices that a serial cable is connected to its POWER
connector, and is ready to accept commands. In this mode, all the subsystems
are enabled (A/D, pulse counters, radio interface, etc.), and the complete
functionality of the device is available.
• Connectivity check mode: in this mode, a special tool is plugged in the POWER
connector, in order for a user to check if the device is able to contact other de-
vices (normally an A730MD or an A730SD). The tool has a LED that will be
pulsed in several modes, depending on the results of the connectivity check
operation. After the operation is finished, the device will enter automatically
the normal operating mode (see next paragraph).
• Normal operating mode: this is the mode where the device polls every 0.5 sec-
onds the RF channel and waits for requests from a master (an A730MD or an
A730SD). In addition, it samples the analog and digital inputs every 5 minutes
and stores the averaged values in the EEPROM FIFO every 15 minutes. The
pulse counters are operated normally.
Figure 24. Flow chart of the Mode Check procedure.
0.5 Sec Interrupt
Return
Terminal mode
SCI
mode?
Yes
No
Yes
PD7 = 1?
PD6 = Out; PD6 = 1
PD7 = In
Enable SCI
No
Storage mode;
Return
PD6 = 0
Yes
PD7 = 1?
Framing error?
No
Yes
Disable SCI
Set STORAGE
STORAGE Set?
No
Return
Normal mode
No
Yes
Do connectivity test;
Reset STORAGE
Return