Communication Protocols
17
10 Communication Protocols

The VP-128H is compatible with the Kramer 2000 Protocol Supported

Subset (see section 10.1), the Sierra Video Systems (SVS) RS-232

Compatible Protocol (see section 10.2), and the Generic Protocol Supported

Subset (see section 10.3).

The following commands (as defined in Table 12) are used to switch between

ASCII protocols and Protocol 2000:

Table 12: RS-232 Commands for Selecting Different Protocols
To Protocol

From Protocol

Protocol
2000
Generic Protocol
Sierra Protocol
Protocol 2000 0x38 0x82 0x81 0x81 0x38 0x81 0x81 0x81
Generic Protocol A1<Enter> A2<Enter>
Sierra Protocol *CHANGE HEX! *CHANGE NORT!

10.1 Kramer 2000 Protocol Supported Subset

This RS-232 communication protocol uses four bytes of information as

defined below. The default data rate is 9600 baud, with no parity, 8 data bits

and 1 stop bit.

MSB LSB
DESTI-
NATION
INSTRUCTION
0 D N5 N4 N3 N2 N1 N0
7 6 5 4 3 2 1 0
1st byte
INPUT
1 I6 I5 I4 I3 I2 I1 I0
7 6 5 4 3 2 1 0
2nd byte
OUTPUT
1 O6 O5 O4 O3 O2 O1 O0
7 6 5 4 3 2 1 0
3rd byte
MACHINE NUMBER
1 OVR X M4 M3 M2 M1 M0
7 6 5 4 3 2 1 0
4th byte