Kramer Electronics SP-12HD - Manual (Page 18)

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Communication Protocol
16
9 Communication Protocol
RS-232 communication between the SP-12HD and the PC is performed
using this protocol (VER 0.1). The protocol
1
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).