Miranda HMP-1801 Instruction Manual download pdf (Page 16)

GUIDE TO INSTALLATION AND OPERATION

12 | HMP-1801

2.4.3 VDCP Connector

The HMP-1801 can interface to a remote recorder using the VDCP protocol via the RS-422 port on the rear panel.

This interface is implemented on an RJ45 connector to save space.

The HMP-1801 supports a subset of the VDCP protocol. A detailed description of the supported commands is

contained in Appendix 2 to this document, beginning on page 71.

The VDCP response delay of the HMP-1801 is not constant. Particular attention was paid to the “immediate

commands” where it is necessary to respond within a frame.

A window of validity has been defined where the response time is constant and guaranteed. The chart and diagram

following illustrate the concept and show the timing for various video formats.

*720p59.94 is the worst case

• For VDCP, the 11 ms

gray zone, where the

processing time may be

either 2 or 3 frames, is

to be avoided.

FORMAT

Acceptance

Zone

Windows FPGA

525

10 ms

21 ms

625

17 ms

28 ms

1080i59.94

10 ms

21 ms

1080i50

17 ms

28 ms

*720p59.94

4 ms

15 ms

720p50

6 ms

17 ms

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 76 77

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Miranda HMP-1801 Instruction Manual Page 16