Eventide VR240, Operator'S Manual

Page: 136 / 155

Model VR240 Audio Logging Recorder
A-4 January 2000
# Character Comments
19
<:> Colon, decimal 58, hex 3A
20 <minute 10s digit> Minute, 00-59
21 <minute 1s digit>
22 <:> Colon
23 <second 10s> Second, 00-59
24 <second 1s>
25 <CR>
26 <LF>
The character string is expected to be generated and received either once per minute or once
per second. To prevent transient errors from accidentally setting the time on the VR240, two
syntactically valid updates must be received sequentially before the internal clock is adjusted.
To be syntactically valid, all the conditions above must be satisfied. If any invalid value is
received, that update is ignored. The day-of-week characters must be valid ASCII characters in
the range A-Z. Any of these characters may be sent; the VR240 does its own day-of-week
calculation and ignores the actual day, but it will check for valid alphabetic characters. The
month abbreviation
is
used, and must be sent and spelled correctly. (Note that CR/LF sent
BEFORE the message is required. It is not absolutely necessary to send the trailing CR/LF
providing one is sent before the next time message.)
To be used, at least two updates, the second showing a time exactly one second or one minute
later than the first, must be received. (Note that they need not be exactly one second or one
minute apart in real time.) When the second update is received, it is compared with the
VR240’s internal clock. If there is a difference of at least two seconds, the internal clock is
updated to match the data received from the time code generator.
It is normal for the VR240 internal time to differ from that of the time code generator by up to two
seconds. It is also normal for the VR240 to require up to a minute before responding to time
changes commanded by the generator.
A-6.
VR240 CLOCK EXAMPLE.
To set the VR240 clock to 13:14:00 on 16 December 1992, send the following character
sequences:
<CR><LF>
“
SP SP
DDD
SP
06DEC92
SP
13:13:00”<CR><LF>
(time delay of approximately one minute)
<CR><LF>
“
SP SP
DDD
SP
06DEC92
SP
13:14:00”<CR><LF>
(or the following, after a time delay of approximately one second)
<CR><LF>
“
SP SP
DDD
SP
06DEC92
SP
13:13:01”<CR><LF>