External app for encoding and transmitting FLEX pager frames at
1600bps/2FSK. Supports short (1-1,933,312) and long (2,101,249-
4,297,068,542) addresses across all encoding sets (1-2, 1-3/1-4, 2-3).
Message types:
- Alphanumeric (vector type 5): 7-bit chars, signature, K checksum
- Standard Numeric (vector type 3): 4-bit BCD, K checksum
- Short/tone-only (vector type 2): space-filled BCD in vector word
- Short numeric (vector type 2): BCD digits in vector word (3/8 digits)
Frame structure:
- FIW (Frame Information Word): cycle, frame, roaming flag
- BIW (Block Information Word) support with up to 3 extra words:
Date, Time, SysInfo/timezone+DST, SSID1 (Simulcast System ID:
Local ID + Coverage Zone), SSID2 (Country Code)
- BCH(31,21) encoding with bit reversal, block interleaving
- Two frames per TX: message R=1 (new) then R=0 (duplicate)
- Message number N (0-63): random seed from RTC, auto-increments
- ERS (Emergency Re-Sync) burst: configurable N x 42-cycle bursts
with 8-cycle preamble per frame
UI:
- Capcode info line: address type, computed frame/phase (reference)
- TX status: step counter with ERS/frame progress
- Set params view: Date/Time/TZ/DST, LocID/CovZone, CountryCode,
Roaming, message number, ERS count
- Date/time auto-populated from RTC with calendar-equivalent year
mapping for years beyond 2025 (per ARIB STD-43A)
- Year validation with equiv-year popup for out-of-range values
- Capcode and BIW flags persisted via SettingsManager
Serial interface:
- sendflex <capcode> <type> <msglen> + payload
- Types: 0=alpha, 1=numeric, 2=short/tone, 3=short numeric
- FlexTosendMessage (ID 103) for serial-to-app communication
- App must be open to receive serial commands
VasylSamoilov
4dce613172