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20 21
Serial Interface Command Set Denitions
There are ten functions using the Serial Interface Engine (SIE). Each
function has the ability to read the current setting from the MT or write new
information to the specified configuration setting.
Serial Interface Command Set Definitions
Command Description
Local Settings
Reads and writes the device’s local 24-bit address and
status line configuration. This allows the option to program all
devices with the same address and status line configuration,
or increment the address to utilize the full range of addresses.
Next User ID
Reads and writes the next available ID location, which will be
given to the next user manually learned into the system.
Specific User
Reads and writes the 24-bit address and status line
configuration for a specific user learned into the system. If a
device in the system is lost or stolen, that specific device can
be removed from the system and replaced with a new one
without having to erase the memory and re-learn all of the
other devices in the system. To remove an existing user, write
0xFF into the address and status line values. 0xFF should not
be used as a learned user.
Target Address
Reads and writes the local device’s 24-bit target address. This
allows a user to communicate directly with a specified target
device and not with any other devices even though they may
have been authorized for communication.
Custom Data Value
Reads and writes a single byte that is sent when Custom Data
is enabled. If enabled, the byte is sent with each packet, and
then output on the SER_IO line of the receiving device along
with the TX ID value and the status line value.
Latch Mask
Reads and writes the Latch Mask for the status line
outputs. This allows each status line to be individually set as
momentary or latched.
Status Value
Reads the current state of the transcoder’s status line outputs.
Writes the value of the status line inputs to send (subject to
I/O mask) and the number of packets to send.
Confirmation EN
Reads and writes the device’s confirmation enable setting.
When enabled, the receiving transcoder immediately transmits
a confirmation packet back to the originating transcoder.
The originating transcoder validates the confirmation and
then activates its CONFIRM line. If the confirmation is not
necessary or the user wants to free the air of additional
transmissions, confirmation can be disabled and the receiving
device does not transmit a confirmation packet.
Targeting EN
Reads and writes the device’s target enable setting. This
enables or disables the option for the transcoder to send a
targeted data packet.
Custom Data EN
Reads and writes the transcoder’s custom data setting. This
enables or disables the option for the transcoder to send a
custom data byte with each transmission.
Figure 16: Serial Interface Command Set Definitions
MT Series Transcoder Serial Interface Engine Timings (ms) at 28,800bps
SER_IO = Input SR_IO = Output
Definition Min
Ready
Max
Ready
Receive
Cmd
Process
Cmd
Reply
Wait
Transmit
Reply
Finish
Process
Min Total
Time
Max Total
Time
Read Local Settings 0.08 17.00 2.80 1.11 4.00 3.10 0.04 11.13 28.05
Write Local Settings 0.08 17.00 2.80 1.03 4.00 1.73 17.80 27.44 44.36
Read Next User ID 0.08 17.00 2.80 1.06 4.00 2.07 0.04 10.06 26.97
Write Next User ID 0.08 17.00 2.80 1.04 4.00 1.73 3.65 13.30 30.22
Read Specific User 0.08 17.00 2.80 1.11 4.00 3.11 0.04 11.14 28.06
Write Specific User 0.08 17.00 2.80 1.04 4.00 1.73 14.30 23.95 40.87
Read Target Address 0.08 17.00 2.80 1.10 4.00 2.77 0.04 10.79 27.71
Write Target Address 0.08 17.00 2.80 1.05 4.00 1.73 10.74 20.40 37.32
Read Custom Data Value 0.08 17.00 2.80 1.07 4.00 2.08 0.04 10.07 26.99
Write Custom Data Value 0.08 17.00 2.80 1.05 4.00 1.73 3.65 13.31 30.23
Read Latch Mask Value 0.08 17.00 2.80 1.07 4.00 2.08 0.04 10.07 26.99
Write Latch Mask Value 0.08 17.00 2.80 1.05 4.00 1.73 3.65 13.31 30.23
Read Status Outputs 0.08 17.00 2.80 1.05 4.00 2.08 0.04 10.05 26.97
Write Status Inputs 0.08 17.00 2.80 1.06 4.00 1.73 ** 9.73 26.65
Read Confirmation EN 0.08 17.00 2.80 1.07 4.00 2.08 0.04 10.07 26.99
Write Confirmation EN 0.08 17.00 2.80 1.06 4.00 1.73 3.65 13.32 30.24
Read Device Targeting EN 0.08 17.00 2.80 1.08 4.00 2.08 0.04 10.08 27.00
Write Device Targeting EN 0.08 17.00 2.80 1.06 4.00 1.73 3.65 13.32 30.24
Read Custom Data EN 0.08 17.00 2.80 1.08 4.00 2.08 0.04 10.08 27.00
Write Custom data EN 0.08 17.00 2.80 1.07 4.00 1.73 3.65 13.33 30.25
MinRdy applies when MT is in Encoder Only mode.
MaxRdy applies when MT is in Transcoder mode and time may be longer due to possible receive timeout period.
Receive Command is calculated for 8 bytes at 28,800bps (34µs/bit).
Transmit Reply is measured on the SER_IO pin from the MT
** Finish Process time for the Write Status Inputs command = 0.06ms + (Packet Time * Number of Packets). See Figure 19 for Packet Time.
Figure 15: MT Series Transcoder Serial Interface Engine Timings (ms) at 28,800bps
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