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5-1
CHAPTER 5 DIGITAL INTERFACE
Output sentences
HDT, VHW
Transmission interval
Selectable among 25ms, 100ms, 200ms, and 1s.
Note: For 25ms, 100ms or 200ms. only HDT is output.
The 25ms setting sets baud rate to 38,400 bps.
Data transmission
Data is transmitted in serial asynchronous form in accordance with the standard referenced in 2.1 of IEC
61162-1. The first bit is a start bit and is followed by data bits, least-significant-bit as illustrated below.
The following parameters are used:
Baud rate: 4800 or 38400 bps
data bits: 8 (D7 = 0), parity none
stop bits: 1
D0 D1 D2 D3 D4 D5 D6 D7
databits
start
bit
stop
bit
Schematic diagrams
IEC-61162-1 output port
64P1106
NH-4P
3
6
5
FL 1
FL 2
F. G.
S. G.
J6
Output drive capability
Max. 10 mA