DM88 is SDI (ASI) form digital video matrix. It may select 4X1, 4X2, 4X3, 4X4,8X1, 8X2, 8X4, 8X8 modes according to the user requests.

〖Front panel〗

  On the front panel A-B eight keys use in selecting the output channel and displaying content corresponding with liquid crystal board "OUTPUT line". When selecting some channel output, it corresponds the letter  glittering. 1-8 uses in selecting the input and displaying content corresponding with liquid crystal board "INPUT line".

  When selecting the B output channel, and input selecting the seventh way, liquid crystal displays as follows:

〖Rear panel〗

Among

COM: 232 strings ports, it joints the computer string port to use the computer common control

REF-IN: The datum video frequency loses the entrance (link to leave)

INPUT1-8: Corresponds 1-8 channel SDI signal input

OUTPUT1-8: Corresponds 1-8channel  SDI signal output

220V 1A: The alternating current supply connects the socket

[ DM88 digit matrix technology parameter ]

Video input: 143-360Mbits/Second serial digital data

Video frequency interface: BNC 75Ω

Input equilibrium: UP to 200m (Belden 8,281)

Video output: 143-360Mbits/ Second serial digital data un-reclock

Output interface: BNC 75Ω

Output signal level: 800mv pk-pk±5%

Vibration: <100ps RMS direct<250ps RMS with 200m cable

Operating temperature: 0-40 ℃

1U standard top carriage case

[ String port communication protocol ]

    The string port communication baud rate is 2,400, the single byte command code (8bbits), a bit starts the position, a bit of stop bit, first half byte selection input channel, latter half byte selection output channel, definition following table:

Channel quantity  input/Output	Input control code (binary system)D7 D6 D5 D4	Output control code (binary system)D3 D2 D1 D0
1/A	0 0 0 0	0 0 0 0
2/B	1 0 0 0	1 0 0 0
3/C	0 1 0 0	0 1 0 0
4/D	1 1 0 0	1 1 0 0
5/E	0 0 1 0	0 0 1 0
6/F	1 0 1 0	1 0 1 0
7/G	0 1 1 0	0 1 1 0
8/H	1 1 1 0	1 1 1 0

    According to above protocol, if output selects the B channel, the input selects 7 channel, then the control code is 68Hex.