ARTHUR HOLM AHDV01 User Manual - Page 12

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AHnet protocol

‐ Communication type : RS422
‐ Connection type : RJ45
‐ Wiring type : CAT‐5
‐ Speed and configuration :
Baud Rate = 38400
Data Bits = 8
Parity = None
Stop Bits = 1
Wiring diagram
Pins 1&2: the units answer
Pins 3&6: the units receive orders
Protocol to control the monitor by addressable RS422 bus. You can connect up to
30 monitors on the same RS422 bus. You can use a AH Interface Ethernet, to
control the RS422 bus. The units should have set address and the address must
start by 1. Maximum cable length between ends, 500m
AHnet Protocol:
Using 5 bytes to communication:
BYTE 0
START BYTE
BYTE 1
ADDRESS BYTE
BYTE 2
COMMAND BYTE
BYTE 3
VALUE 1
BYTE 4
VALUE2
12
1-
Data TX+
2-
Data TX-
3-
Data RX+
4-
NC
5-
NC
6-
Data RX-
7-
NC
8-
NC