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RS-232 / IP Communication Protocol
ACK Type B (2 Bytes)
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
AB
ACC
0
0
Device ID (0x20)
LB
Length for the total data bytes (Index+Value)
IB
Index
VB
Value
CB
CRC
ACC: The devices acknowledge status. Accept or Reject.
1: Command is accepted (ACK).
2: Command is rejected (NAK).
Device ID: The HXL-
44’s ID is 0x20.
LB: LB value is equal to the total data bytes (Index+Value), not including the CRC byte.
IB & VB: IB/VB often is the input or output port number depending on the command.
Please see table below.
CB: Device always sends the CRC byte following the last byte.
IB/VB: Command Response
Command
Description
Index
Value
0x07
Request Video Output Channel
Output
Input
0x09
Request Video Input Plug Status
Input
0: Unplugged
1: Plugged in
0x0B
Request Video Output Plug
Status
Output