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KRAMER: SIMPLE CREATIVE TECHNOLOGY
Communication Protocol
10
7 Communication
Protocol
1
RS-232 communication between the FC-7402 and the PC is done using the following protocol. The protocol uses four bytes of
information, and data is at 9600 baud, no parity, 8 data bits and 1 stop bit. The controller and machine should be connected via
a null-modem connection, that is, if using a DB-9 port, connect as follows:
Connect pin 5 of the PC to pin 5 of the machine
Cross pins 2 and 3, i.e., 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
On the PC side, short pins 1, 7 and 8
Table 6: Structure of the Protocol
MSB
LSB
INSTRUCTION
0
TO
PC
I5 I4 I3 I2 I1
I0
7
6
5 4 3 2 1
0
1st byte
DATA
1
D6
D5 D4 D3 D2 D1
D0
7
6
5 4 3 2 1
0
2nd byte
EXTENDED
DATA
1
E6
E5 E4 E3 E2 E1
E0
7
6
5 4 3 2 1
0
3rd byte
MSB’s
ADDR
1
E7
D7 0 1 1 1
0
7
6
5 4 3 2 1
0
4th byte
2
Note that the MSB’s 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.
Table 7: Instruction Set for the FC-7402
INSTRUCTION
Dec
Hex
I7
I6
I5
I4
I3
I2
I1
I0
0 0
Reset
0 0 0 0 0 0 0 0
3 3
Store
machine
settings
0 0 0 0 0 0 1 1
4 4
Recall
machine
settings
0 0 0 0 0 1 0 0
5 5
Set
Video
Parameter
0 0 0 0 0 1 0 1
6 6
Request
Video
Parameter 0 0 0 0 0 1 1 0
7 7
Read
video
encoder
data 0 0 0 0 0 1 1 1
8 8
Write
video
encoder
data 0 0 0 0 1 0 0 0
10 A Write
EEPROM
data
0 0 0 0 1 0 1 0
11 B Read
EEPROM
data
0 0 0 0 1 0 1 1
12 C Write
I²C
0 0 0 0 1 1 0 0
13 D Read
I²C
0 0 0 0 1 1 0 1
14 E Read
video
standard
0 0 0 0 1 1 1 0
15 F Is
setup
defined?
0 0 0 0 1 1 1 1
16 10 Error
0 0 0 1 0 0 0 0
30 1E Lock
Front
Panel
0 0 0 1 1 1 1 0
31 1F Request
Bar
0 0 0 1 1 1 1 1
57 39 Enable
“Power-down
save”
0 0 1 1 1 0 0 1
61 3D Identify
machine
0 0 1 1 1 1 0 1
1 VER-0.1
2 Note that the MSB’s of the DATA (D7) and the EXTENDED DATA (E7) are in the fourth byte