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Command sequence
In most cases the controlled device will not send an ACK in response to transport control or data preset
commands sent from the external controller.
The controlled device will send back a return command in response to data sense commands that request a data
value specified on the controlled device.
When the status of the controlled device changes, such as from Stop to Play mode, or when an error etc. occurs,
the controlled device will send a command indicating this to the external controller.
Examples of the command sequence are given below.
You must leave an interval of at least 20 ms between commands.
Example 1:
Controlling the transport of the controlled device
This example describes the Play operation.
When the controlled device receives the PLAY command and enters Play mode, it will transmit a CHANGED
STATUS command. ACK is not transmitted for the PLAY command.
External controller
PLAY
Example 2:
Presetting data
This example describes setting the AUTO CUE LEVEL.
When the controlled device receives the AUTO CUE LEVEL PRESET (Preset) command, it will set its AUTO
CUE LEVEL. ACK is not transmitted for this command.
External controller
AUTO CUE LEVEL
PRESET (Preset –54dB)
Example 3:
Obtaining specified data
This example describes obtaining the currently-set AUTO CUE LEVEL.
When the controlled device receives the AUTO CUE LEVEL PRESET (Sense) command, it will return the
currently-set AUTO CUE LEVEL.
External controller
AUTO CUE LEVEL
PRESET (Sense)
Example 4:
Checking the status of the controlled device, and performing the next operation
When the operating status of the controlled device changes, it will transmit CHANGED STATUS. By using
CHANGED STATUS as a trigger for sending MECHA STATUS SENSE, the new operating status can be
determined. This example shows how to check the RECORD-READY status of the controlled device and then
initiate recording.
External controller
RECORD (Record Ready)
MECHA STATUS SENSE
RECORD (Record)
Command
Controlled device
->
<-
CHANGED STATUS
Command
Controlled device
->
Command
Controlled device
->
<-
AUTO CUE LEVEL RETURN
Command
Controlled device
->
CHANGED STATUS
<-
->
<-
MECHA STATUS RETURN
->
<-
CHANGES STATUS
TASCAM HS-8 RS-232C Protocol Specification
State of controlled device
Stopped
Transmit when starting Play
State of controlled device
AUTO CUE LEVEL set to -54dB
State of controlled device
State of controlled device
Stopped
Transmitted when entering record-ready
state
Returns record-ready state
Transmitted when entering record state
7
TEAC Corporation
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