Tascam HD-R1 Technical Information page 5

Output commands
Parameter value response
When the command field of a message being set contains "=" (equal sign), the HD-R1is reporting the current value of
the parameter. Usually, character strings for parameter IDs and their values match the text shown on the LCD user
interface screen. For example:
Input Source?
Input Source=S/PDIF
Error responses
When the command field of a message being sent to it contains "?" (question mark), if the HD-R1 cannot interpret
the received message it reports an error. For example, the HD-R1 will respond as follows if it receives a parameter
query for an invalid parameter called "Blah."
Blah?
Blah???
If the HD-R1 receives an invalid parameter set command, it will respond as follows.
Blah=Foo
Blah???Foo
Set value refusal responses
If the HD-R1 receives a parameter set command for a valid parameter, but the value is invalid, the HD-R1 will
respond with "!" (exclamation point) added to the command field.
Input Source=Blah
Input Source!Blah
If the HD-R1 receives a parameter set command for a valid parameter, but the value is missing, the HD-R1 will
respond as follows.
Input Source=
Input Source!Missing Value
Some parameters can be applied only when the transport is stopped. If you try to change one of these parameters
when the transport is not stopped, the HD-R1 responds with "*" (asterisk). For example, if you try to change the
sampling frequency while recording, the HD-R1 will respond as follows.
WAV Sample Rate=44.1 kHz
WAV Sample Rate*44.1 kHz
Special incoming commands
End markers
By sending a line feed (LF) or carriage return and line feed (CR LF), the HD-R1 can be informed of the end of a
message. The HD-R1 can accept this query or command at any time. After turning the power on, the end marker is set
to CR LF by default. The following are end marker setting commands.
End Marker=LF
End Marker=CR LF
TASCAM HD-R1 RS-232C Protocol Specifications
5 TEAC Corporation