Carrier 23XL User Manual download pdf (Page 19)

Communication Protocol

1000 0010 Input #2

1000 1001 in composite video group

1000 0001 Machine #1 (master)

Was sent from the PC, then the switcher (machine #1) will switch input 2 in composite video group to its output. If the user

switched input 4 in the VGA group via the front panel keypad, then the switcher will send:

0100 0001

1000 0100

1000 0011

1000 0001 to the PC.

When the PC sends instruction #1 or #2 to the switcher, then, if the instruction is valid, the switcher replies by sending the

same four bytes to the PC that were sent (except for the first byte, where the DESTINATION bit is set high).

NOTE 3

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 to the value of the requested parameter. The reply to the instruction #5 (what is the status of the VGA

group?):

0000 0101

1000 0000

1000 0011

1000 0001

Would be:

0100 0101

1000 0000

1000 0100

1000 0001

NOTE 4

An error code is returned to the PC if an invalid code was sent to the switcher (for example, when trying to switch an input or

a group which is 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 will not be valid.

NOTE 5

Under normal conditions, the machine’s present status is saved each time a change is made. The power-down save (the auto

save) may be disabled using this code. Note that each time that the machine is turned ON, the auto save function is

automatically set.

NOTE 6

This is a request to identify the switchers in a 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 the OUTPUT. For example, the reply to the request to send the machine’s name (for

machine #001) will be:

0111 1101

1000 0000 (i.e. 128+0)

1001 0111 (i.e. 128+23)

1000 0001

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 following the decimal point. For example, for version

3.5 the reply will be:

0111 1101

1000 0011 (i.e. 128+3)

1000 0101 (i.e. 128+5)

1000 0001

NOTE 7

GAIN VALUE – Number from 0 to 127

Gain Value = 0 Mute

Gain Value = 115

out

Gain Value = 127

out

NOTE 8

One step = 0. 5 dB

NOTE 9

Answer = Current Audio Gain (0 –127)

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Carrier 23XL User Manual Page 19

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