Rs-422 Protocol Reference V1.0 - Datavideo HDR-45 Quick Start Manual

RS-422 Protocol Reference V1.0

1. Interface Overview
Conforming to EIA RS-422A.
1
Full duplex communications channel is utilized.
2
Data is transmitted asynchronously, bit serial, word serial with data exchange between devices.
3
Standard transmission rate on the interface bus is 38400 bits per seconds (bps)
4
5 The data word utilized by the interface system is as follows :
D0
START
BIT
1 Start bit + 8 Data bits + 1 Parity bit + 1 Stop bit. Odd Parity
6
ODD parity : The total of "1"s in D0+D1+ . . . D7+PARITY equals an odd number.
D1 D2 D3 D4 D5 D6 D7 PARITY
(ODD)
25
STOP
BIT