ARTHUR HOLM AHDTLM UC User Manual - Page 10

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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 device by addressable RS422 bus. You can connect
up to 30 dvices 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
10
1-
Data TX+
2-
Data TX-
3-
Data RX+
4-
NC
5-
NC
6-
Data RX-
7-
NC
8-
NC