[time-nuts] Undocumented FE-5680A commands

Scott Newell newell+timenuts at n5tnl.com
Thu Jan 19 00:47:11 EST 2012


I'm playing around with the unlockable problem child.  Turns out I 
get a response from the unit to several undocumented serial port 
commands.  In particular, the replies from 0x22, 0x57, 0x59, and 0x5A 
seem to vary each time I read the unit.  Not all the commands respond 
each time; there's certainly a bug or two lurking.  (I'm probably 
getting the poor unit's serial input all confused and out of 
sync.)  Anyway, commands 0x57 and 0x59 appear to send back a lot of 
data: 0x56 bytes!

I'm not yet validating the data length or checksum of the FE-5680 reply.

Here's an example of the replies to the commands (in hex):

Reply to command 0x22, 0x0D bytes: [22] [0D] [00] [2F] [20] [5B] [29] 
[00] [A1] [C8] [4A] [1D] [6C]

Reply to command 0x29, 0x09 bytes: [29] [09] [00] [20] [FF] [00] [00] 
[00] [FF]

Reply to command 0x2B, 0x09 bytes: [2B] [09] [00] [22] [20] [5B] [29] 
[00] [52]

Reply to command 0x2D, 0x09 bytes: [2D] [09] [00] [24] [20] [5B] [29] 
[00] [52]

Reply to command 0x47, 0x08 bytes: [47] [08] [00] [4F] [20] [5B] [29] [52]

Reply to command 0x53, 0x07 bytes: [53] [07] [00] [54] [79] [00] [79]

Reply to command 0x57, 0x56 bytes: [57] [56] [00] [01] [20] [20] [5B] 
[29] [00] [A1] [48] [4E] [1D] [C0] [00] [D6] [72] [85] [6A] [DB] [25] 
[80] [14] [8A] [BD] [2E] [5E] [86] [CB] [BA] [E5] [CA] [F5] [2D] [0F] 
[4F] [7F] [D3] [D1] [37] [2B] [2C] [90] [54] [45] [68] [9A] [AC] [AA] 
[4B] [50] [33] [CF] [9B] [2B] [FD] [BD] [E6] [AD] [6D] [6B] [BA] [FF] 
[FA] [17] [03] [62] [F4] [E8] [79] [00] [83] [23] [C1] [17] [69] [37] 
[18] [8E] [E9] [13] [A3] [FB] [1F] [1B] [F8]

Reply to command 0x59, 0x56 bytes: [59] [56] [00] [0F] [20] [20] [5B] 
[29] [00] [A1] [C8] [4A] [1D] [40] [00] [D6] [72] [95] [6A] [DB] [25] 
[80] [54] [8A] [BD] [3C] [5E] [86] [C9] [BA] [E5] [CA] [F5] [2D] [0D] 
[4F] [7F] [D3] [D5] [37] [2B] [2C] [90] [54] [45] [68] [BA] [BC] [EA] 
[4B] [50] [33] [CF] [9B] [29] [FD] [BD] [E6] [AD] [6C] [6B] [BE] [FF] 
[FA] [15] [02] [62] [F4] [E8] [D8] [57] [83] [23] [C1] [17] [68] [37] 
[18] [86] [E9] [13] [AB] [FB] [5F] [1B] [79]

Reply to command 0x5A, 0x0D bytes: [5A] [0D] [00] [57] [00] [00] [40] 
[08] [9E] [07] [00] [00] [D1]

Reply to command 0x61, 0x09 bytes: [61] [09] [00] [68] [20] [5B] [29] 
[00] [52]

Reply to command 0x65, 0x07 bytes: [65] [07] [00] [62] [20] [20] [20]

Reply to command 0x67, 0x08 bytes: [67] [08] [00] [6F] [01] [F4] [B8] [4D]

Reply to command 0xF0, 0x0E bytes: [F0] [0E] [00] [FE] [33] [2E] [34] 
[00] [00] [00] [00] [00] [00] [29]

Interesting, huh?  ;-)


-- 
newell  N5TNL





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