KRAMER: SIMPLE CREATIVE TECHNOLOGY
Communication Protocol
28
NOTE 4
- The reply to a "REQUEST" instruction is as follows: the same instruction and INPUT codes as were sent are
returned, and the OUTPUT is assigned the value of the requested parameter. The replies to instructions 10 and 11 are as per
the definitions in instructions 7 and 8 respectively. For example, if the present status of machine number 5 is breakaway
setting, then the reply to the HEX code
0B
80
80
85
would be
4B
80
81
85
NOTE 5
– For the OUTPUT byte set as 6, the VIS source is the input selected using the OUTPUT byte. Similarly, for the
OUTPUT byte set as 7, the VIS source is the output selected using the OUTPUT byte. Note also, that on some machines the
sync source is not software selectable, but is selected using switches, jumpers, etc!
NOTE 6
– If INPUT is set to 127 for these instructions, then, if the function is defined on this machine, it replies with
OUTPUT=1. If the function is not defined, then the machine replies with OUTPUT=0, or with an error (invalid instruction
code), or will not reply.
If the INPUT is set to 126 for these instructions, then, if possible, the machine will return the current setting of this function,
even for the case that the function is not defined. For example, for a video switcher which always switches during the VIS of
input #1, (and its VIS setting cannot be programmed otherwise), the reply to the HEX code
4A
FE
80
81 (ie. request VIS setting, with INPUT set as 126dec)
would be
4A
FE
81
81 (ie. VIS setting = 1, which is defined as VIS from input #1).
NOTE 7
– Setting OUTPUT to 0 will return the VIS source setting as defined in instruction #7. Setting to 1 will return the
input # or output # of the sync source (for the case where the VIS source is set as 6 or as 7 in instruction #7). Setting to 2
returns the vertical sync frequency (0 for no input sync, 50 for PAL, 60 for NTSC, 127 for error).
NOTE 8
- The reply to the "REQUEST WHETHER SETUP IS DEFINED" is as in TYPE 3 above, except that here the
OUTPUT is assigned with the value 0 if the setup is not defined; or 1 if it is defined.
NOTE 9
- An error code is returned to the PC if an invalid instruction code was sent to the switcher, or if a parameter
associated with the instruction is out of range (e.g. trying to save to a setup greater than 15, or trying to switch an input or
output greater than the highest one defined). This code is also returned to the PC if an RS-232 instruction is sent while the
machine is being programmed via the front panel. Reception of this code by the switcher is not valid.
NOTE 10
– This code is reserved for internal use.
NOTE 11
– For machines where the video and / or audio gain is programmable. The value of the gain is represented in twos
complement form to allow for negative values (attenuation).
NOTE 12
- Under normal conditions, the machine's present status is saved each time a change is made. The "power-down"
save (auto-save) may be disabled using this code. Note that whenever the machine is turned on, the auto-save function is set.
NOTE 13
- This is a request to identify the switcher/s in the system. If the INPUT is set as 1 or 2, the machine will send its
name. The reply is the decimal value of the INPUT and OUTPUT. For example, for a 2216, the reply to the request to send
the audio machine name would be (HEX codes):
7D
96
90
81 (i.e. 22dec for 2nd byte, and 16dec for 3rd byte).
If the request for identification is sent with the INPUT set as 3 or 4, the appropriate machine will send its software version
number. Again, the reply would be the decimal value of the INPUT and OUTPUT - the INPUT representing the number in
front of the decimal point, and the OUTPUT representing the number after it. For example, for version 3.5, the reply to the
request to send the version number would be (HEX codes):
7D
83
85
81 (i.e. 3dec for 2nd byte, 5dec for 3rd byte).
NOTE 14
- The number of inputs and outputs refers to the specific machine which is being addressed, not to the system. For
example, if six 16X16 matrices are configured to make a 48X32 system (48 inputs, 32 outputs), the reply to the HEX code
3E
82
81
82 (ie. request the number of outputs)
would be
7E
82
90
82
ie. 16 outputs
NOTE 16
- The reply to the “REQUEST WHETHER PANEL IS LOCKED” is as NOTE 4 above, except that here the
OUTPUT is assigned with the value 0 if the panel is unlocked, or 1 if it is locked.
