Roland TD-7 - Page 169

OExarnple of actual MIDI messages
=1 1-1&1-\.\1i‘i.1Z 2*--Ci-) =19
"Cn" is at status of :1 I‘rn;.=:ram chamzu message, and "n" is a
.\-IIDI channel numhur.
‘Hit: .~;vt.'t'mti I1}-‘tn is 21 Pmgrant I‘ttIt¥I|'JC?f‘.
9!! = 9, -1911 ?3
So. this is a Prngram chanm: message of MIDI channel in,
l'mp;ram nt:n1t.10r=-* "M.
OExampIe and Checksum of Roland System Exclusive
messages
Rnlanct Systt-.\m I-Ixc|usi\'u messages €RQl and DTI) have a Checksum at the
end nf the data (before 15024) tn check tnr cnmmunicatinn errors.
The Chccksunt results from address and data (ur size) inuiudcd in the message.
<f,'-Wluw tn caiculutc C‘-hr:t:ksums {"11" indicates I-l0xur!0t*irn:|l.}
Thu terror cltuckimz tlnacuss 1:505 B Chi;-clisunt and Drnvidtrs a bit pattern whore
the last significant T bits are zern when values for an address. data (or size)
um! the Cht.-cksum are summtzrt.
if tho atidrvss is “an Uh cull" and the data ( nr the size} is "rid ea: HI!"
aa -- ht) - cc (id -' cc —-- If == sum
sum : $28 I qtmlicnt remainder
I28 -- rcmaémicr chvcksum
<11-II'(.-\=\-¥PI.1-I I Set Decay oi the Instrument I tn 0.
the "Parameter address map"
Aztdrtzss : 01 fit! 00 OCH (Oi OI} 00 E1012 ~* fit} 00 OCH}
the value nf I)ccu,\':(} is IFII
Ff} -H H] 5H 13 {H (H3 08 {EC IF '3'.’ FT
(1) (EH11) t'--{H51} :iUdrI.':~;s data t:I|:;'r_'I-Jsmm {B}
ti) I-Ifcciusivc Status I-"H .\iu(1t.-I H) (TD 7}
(I-J) H3 Htnland) (5) Command II) IDTIE
(3) D0vi£‘.c ID (fit (ft) End 06 Exclusive
The Chucksurn is :
OH! -~ 00!-1 ~- 00}-I - OCH »- H-‘I-I I * {J »- 0 I2 ~ 31 = 44 (sum)
-M (sum) 1- I23 = 0 (quotient) M (remainder)
chccksum I28 -- 4-'1 (remainder) 84 5-1}!
TI\L‘I‘UIti|‘L‘. the n11;-ssa;_;r: tn send is : Ft) -H 10 58 12 O] O0 00 DC IF 5-I F7.
<I |.Z.\':\:\IPl.lZ 2 blicquust tn transfer the lrzstrumcnt number of Soundl. NOTE
.\3L'.\-HJER -10. Patch 2.
.7‘\€('}'I'i'I NU}-Hi!”-IR 40 is 2811 in hC'K£1dt:ci¥1'ta¥.
Sec the "Parameter address map"
Acltircss 2 (JG DI 28 U351 (Of) O0 {IO HO]! -‘ OI 23 03H)
Siiit-.' I U0 GU U0 U251
F0 43 H1 58 it 00 U! 28 D3 {H} 08 {IO B2 '3? FT
tl)(2H3H=1>(5) address size chccksumtfi)
(1) i$.\ct:lusi\'e Status (4) Model ID (TI)-7)
(2) ii”) (Roman!) (5) Cnmmanrl ID (UT!!-
{3) Device II) {I7} (G) I-Ind act {Exclusive
The Chucksum is :
U01! OIH -- 281% 03!] - OOH -- 00!-I -- t'1t}H -t 02H
= n - I - -1!! - 3 - t) -~O -~ U --+ 2 46 (sum)
46 (sum) 1% 328 - 0 (quotient) 46 {remainder}
chccksnm I28 - -iii {remainder} B2 52!!
Thurufnre. the m£‘SSiltl'.lJ In send is : Ft? -1t tfi 53 I! U0 (H 28 03 00 00 O0
02 52 I-‘?.