Communication Protocol; Table 4: Structure Of The Protocol; Table 5: Instruction Set For The 7508 - Kramer DigiTOOLS 7508 User Manual

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Communication Protocol

RS-232 communication with the 7508 complies with the following protocol.
The protocol uses 4 bytes of information, and data is at 9600 baud, with no
parity, 8 data bits and 1 stop bit.
MSB
0 TO PC
7 6
1st byte
1 D6
7 6
2nd byte
1 E6
7 6
3rd byte
MSB's
1 E7
7 6
1
4th byte
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"
A0 is the "LSB of the MACHINE ADDRESS"
•
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.
# INSTRUCTION
0 Reset
1 Read video standard
3 Read back-panel DIP-switch 1 (video format CV/YC)
10 Write EEPROM data – low address
11 Read EEPROM data – low address
12 Write I²C
13 Read I²C
16 Error
57 Enable "Power-down save"
61 Identify machine
1 Note that the MSB's of the DATA (D7) and the EXTENDED DATA (E7) are in the fourth byte
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Communication Protocol

Table 4: Structure of the Protocol

I5 I4
5 4
D5 D4
5 4
E5 E4
5 4
D7 0
5 4

Table 5: Instruction Set for the 7508

INSTRUCTION
I3 I2
3 2
DATA
D3 D2
3 2
EXTENDED DATA
E3 E2
3 2
0 1
3 2
I5 I4
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 1
1 1
1 1
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LSB
I1 I0
1 0
D1 D0
1 0
E1 E0
1 0
ADDR
1 0
1 0
I3 I2 I1 I0
0 0 0 0
0 0 0 1
0 0 1 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
0 0 0 0
1 0 0 1
1 1 0 1