Ahnet Protocol - ARTHUR HOLM AHDTLM UC User Manual

AHnet protocol

Communication type : RS422
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Connection type : RJ45
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Wiring type : CAT-5
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Speed and configuration :
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Baud Rate = 38400
–
Data Bits = 8
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Parity = None
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Stop Bits = 1
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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