Linx Technologies LICAL-TRC-MT User Manual
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Time t1 in the figure above does not have to be any specific time, just
so long as the SER_IO line goes high before the CRT/LRN line. Time t2
should be greater than 120µs (typical of 35ms, see the Mode Entry Timings
section) to ensure that the transcoder goes into Serial Mode. There is not a
maximum time specified. Once in Serial Mode, the transcoder waits for the
start byte (0x00) of the serial command.
The timings associated with each command and the transcoder’s response
are listed in Figure 14 (9,600bps) and Figure 15 (28,800bps).
To send consecutive commands, keep the CRT/LRN line high and take the
SER_IO line high within 50µs of the MODE_IND line going low.
It should be noted that all of the settings are written into non-volatile
memory, so they are retained if power is removed from the chip. This
includes all values, such as custom byte and target address, as well as the
enabled / disabled states.
start
stop start
stop
CRT/LRN (INPUT)
MODE_IND (OUTPUT)
SER_IO (INPUT/OUTPUT)
00
00
R
SER_IO = INPUT
SER_IO = OUTPUT
1mS
C
C
C
C
C
C
FF
4mS
A
A
A
R
R
R
FF
Command
Acknowledge/Response
b0 b1 b2 b3 b4 b5 b6
b6
b7
b7
b0 b1 b2 b3 b4 b5
t
1
t
2
Figure 13: MT Series Transcoder Serial Programming
MT Series T
ranscoder Serial Interface Engine Timings (ms) at 9,600bps
SER_IO = Input
SR_IO = Output
Definition
Min
Ready
Max
Ready
Receive
Cmd
Pr
ocess
Cmd
Reply
W
ait
Transmit
Reply
Finish
Pr
ocess
Min T
otal
Time
Max T
otal
Time
Read Local Settings
0.08
33.00
8.30
1.11
4.00
9.58
0.04
23.11
56.03
W
rite Local Settings
0.08
33.00
8.30
1.03
4.00
5.29
17.89
36.59
69.51
Read Next User ID
0.08
33.00
8.30
1.06
4.00
6.38
0.04
19.86
52.78
W
rite Next User ID
0.08
33.00
8.30
1.04
4.00
5.29
3.65
22.36
55.28
Read Specific User
0.08
33.00
8.30
1.11
4.00
9.58
0.04
23.11
56.03
W
rite Specific User
0.08
33.00
8.30
1.04
4.00
5.29
14.30
33.05
65.93
Read T
arget Addr
ess
0.08
33.00
8.30
1.10
4.00
8.51
0.04
22.03
54.95
W
rite T
arget Addr
ess
0.08
33.00
8.30
1.05
4.00
5.29
10.74
29.46
62.38
Read Custom Data V
alue
0.08
33.00
8.30
1.07
4.00
6.38
0.04
19.87
52.79
W
rite Custom Data V
alue
0.08
33.00
8.30
1.05
4.00
5.29
3.65
22.37
55.29
Read Latch Mask V
alue
0.08
33.00
8.30
1.07
4.00
6.38
0.04
19.87
52.79
W
rite Latch Mask V
alue
0.08
33.00
8.30
1.05
4.00
5.29
3.65
22.37
55.29
Read Status Outputs
0.08
33.00
8.30
1.05
4.00
6.38
0.04
19.85
52.77
W
rite Status Inputs
0.08
33.00
8.30
1.06
4.00
5.29
**
18.79
51.71
Read Confirmation EN
0.08
33.00
8.30
1.07
4.00
6.38
0.04
19.87
52.79
W
rite Confirmation EN
0.08
33.00
8.30
1.06
4.00
5.29
3.65
22.38
55.30
Read Device T
argeting EN
0.08
33.00
8.30
1.08
4.00
6.38
0.04
19.88
52.80
W
rite Device T
argeting EN
0.08
33.00
8.30
1.06
4.00
5.29
3.65
22.38
55.30
Read Custom Data EN
0.08
33.00
8.30
1.08
4.00
6.38
0.04
19.88
52.80
W
rite Custom data EN
0.08
33.00
8.30
1.07
4.00
5.29
3.65
22.39
55.31
MinRdy applies when MT is in Encoder Only mode.
MaxRdy applies when MT is in T
ranscoder mode and time may be longer due to possible r
eceive timeout period.
Receive Command is calculated for 8 bytes at 9,600bps (104
µs/bit).
Transmit Reply is measur
ed on the SER_IO pin fr
om the MT
** Finish Pr
ocess time for the W
rite Status Inputs command = 0.06ms + (Packet T
ime * Number of Packets).
See Figur
ime.
Figure 14: MT Series Transcoder Serial Interface Engine Timings (ms) at 9,600bps