Kramer SP-12HD [18/23] Communication protocol

KRAMER: SIMPLE CREATIVE TECHNOLOGY

Communication Protocol

9 Communication Protocol

RS-232 communication between the SP-12HD and the PC is performed

using this protocol (VER 0.1). The protocol

The controller and the machine should be connected via a null-modem

connection, that is, if using a 9-pin D-sub port, connect pin 5 of the PC to

pin 5 of the machine, cross pins 2 and 3, that is, connect pin 2 of the PC to

pin 3 of the machine, and connect pin 3 of the PC to pin 2 of the machine.

On the PC side, short pins 4 and 6, and short pins 1, 7 and 8.

uses four bytes of information,

and transmission settings are 9600 baud, no parity, 8 data bits and 1 stop bit.

Table 5: Structure of the Protocol

MSB

LSB

INSTRUCTION

0 TO PC I5 I4 I3 I2 I1 I0

7 6 5 4 3 2 1 0

Byte 1

DATA

1 D6 D5 D4 D3 D2 D1 D0

7 6 5 4 3 2 1 0

Byte 2

EXTENDED DATA

1 E6 E5 E4 E3 E2 E1 E0

7 6 5 4 3 2 1 0

Byte 3

MSBs

ADDR

1 E7 D7 1 1 0 0 0

7 6 5 4 3 2 1 0

Byte 4

Note that the MSBs of the DATA (D7) and the EXTENDED DATA (E7) are in the fourth byte.

Terminology:

 TO PC is the “DESTINATION BIT”

 I4..I0 is the “INSTRUCTION”

 D7..D0 is the “DATA”

 E7..E0 is the “EXTENDED DATA”

The destination bit, TO PC, is 0 when sending from the PC to the machine, or 1 when sending from the machine

to the PC.

1 This protocol complements Kramer’s “Protocol 2000” (Kramer’s switcher protocol), that is, the two protocols can co-exist

without disturbing one another (according to Protocol 2000’s definitions, the SP-12HD would be machine number 24).