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Device manual
AS-i / RS-485 gateway
AC1155
UK
7391078/02 04/2016
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RS-485 gateway
Contents
1 Preliminary note � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
2 Safety instructions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
3 Documentation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
4 Functions and features � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
4�1 Receiving data via the RS-485 gateway � � � � � � � � � � � � � � � � � � � � � � � � � � 4
4�2 Sending data via the RS-485 gateway � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
5 Manufacturer-specific device behaviour � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
5�1 Status model (Root Device Profile) � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
5�2 Status transition table� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
6 Acyclic CTT2 services� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
6�1 Standard services� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
6�1�1 Standard ID object � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
6�1�2 Standard diagnostic object� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
6�2 Exchange device parameters� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
6�3 Exchange serial data � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
6�4 Data structures � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
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RS-485 gateway
1 Preliminary note
This document applies to the device AC1155�
This document is intended for specialists� These specialists are people who are
qualified by their appropriate training and their experience to see risks and to
avoid possible hazards that may be caused during operation or maintenance of
the device� The document contains information about the correct handling of the
device�
Read this document before use to familiarise yourself with operating conditions,
installation and operation� Keep this document during the entire duration of use of
the device�
Adhere to the safety instructions�
2 Safety instructions
UK
These instructions contain texts and figures concerning the correct handling of the
device and must be read before installation or use�
Observe the operating instructions� Non-observance of the instructions, operation
which is not in accordance with use as prescribed below, wrong installation or
incorrect handling can seriously affect the safety of operators and machinery�
3 Documentation
This documentation relates to the hardware and firmware status at the time of
editing this manual�
4 Functions and features
The devices have been designed for use in applications described in this manual
and the data sheet�
Adhere to the data indicated in the data sheets and in the manual� If the handling
specifications and safety instructions for configuration, installation and operation
indicated in the documentation are adhered to, the devices normally do not lead to
any danger for persons and objects�
The AS-i / RS-485 gateway is a slave for the AS-Interface fieldbus system� It
corresponds to the V3�0 specification and can be operated in the extended
addressing mode�
● AS-i profile S-B�A�5, the CTT2 communication protocol is implemented�
The AS-i / RS485 gateway is used to connect devices with an RS485 interface
(text displays, code readers, measurement devices����) to AS-Interface�
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RS-485 gateway
Parameter data is stored permanently in the slave memory� Since the
process of storing takes several 100 ms, the CTT2 communication will stop
and resume after a reset of the device only�
4.1 Receiving data via the RS-485 gateway
The slave cyclically transmits the number of bytes that have been received and
that are available for reception via AS-Interface� The receive buffer in the slave has
a size of 64 bytes�
The master should then send "18, 3, xx" (acyclic read service request to index 3
with a usable length of xx bytes) to collect the information�
If more than 32 bytes are in the buffer, the command may be issued several times
with a maximum length of 32 bytes until the buffer is empty� If there are fewer
bytes in the buffer than required, the response contains all available bytes� If an
acyclic read service request to index 3 is issued while the buffer is empty, the
response is an error "illegal length"�
If single bit transmission errors occur, AS-Interface will repeat faulty telegrams and
recover lost information� If byte transmission errors occur, the data may be lost�
4.2 Sending data via the RS-485 gateway
The master sends "19, 3, xx, ��� data���" (acyclic write service request to index 3
with a usable length of xx bytes) to transmit the output information�
If more than 32 bytes are to be transmitted, this write service may be repeated
several times with a maximum length of 32 bytes� Since the RS-485 interface is
faster than AS-Interface, there is no danger of buffer overrun�
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5 Manufacturer-specific device behaviour
5.1 Status model (Root Device Profile)
Initialisation
1
Configuration
RS-485 gateway
2
Start serial
communication
3
Recognition
4
Normal
7
5
6
5.2 Status transition table
Name Description
Initialisation Initial state of the device upon power-up� The device switches all
outputs into off-state�
Configuration The device is available for all AS-i commands except "Data_
Exchange"� The device is waiting for a command "Write_
Parameter"
Start serial communication The device is waiting for the master to initialise serial data
communication� Binary data bits are valid�
UK
Recognition The device is waiting for the message "Get ID"� It will not
respond to any other message�
Normal The device is available for automatic operation�
Transition Output status Final State Transition Condition
1 Initialisation Configuration Initialisation performed without error
2 Configuration Start serial
data transmission
3 Start serial
Recognition Serial communication successfully
data transmission
4 Recognition Normal "Get ID" and
"Write_Parameter" received and
processed without error
established
"ID string" messages exchanged�
5 Recognition Start serial
data transmission
6 normal Start serial
data transmission
Serial communication error
(e�g� timeout)
Serial communication error
(e�g� timeout)
7 Initialisation Timeout of data communication
(>40ms without "Data_Exchange")
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RS-485 gateway
6 Acyclic CTT2 services
The following services are supported
Code 16 – Acyclic standard read requests
Code 18 – Acyclic read requests
Code 19 – Acyclic write request services
Code 16 – Acyclic standard read requests
Index no. Description
0 ID object
1 Diagnosis object
Code 18 – Acyclic read requests
Index no. Description
2 Reading parameters
3 Read data
Code 19 – Acyclic write request services
Index no. Description
2 Write parameters
3 Write data
6.1 Standard services
6.1.1 Standard ID object
This object range describes and identifies the AS-i slave� Identification with
reference to
• Manufacturer ID and
• Device ID
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Read standard ID object request
Byte no. Description
0 Command code 16 = read standard
1 Index 0 = ID object
2 Length to be read = 5
Read standard ID object reply
RS-485 gateway
Byte no. Description
0 Command code 80 = read standard OK
1 AS-i manufacturer ID (high) = 00
2 AS-i manufacturer ID (low) = 04
3 AS-i device ID (high) = 00
4 AS-i device ID (low) = 65
hex
hex
5 Number of analogue AS-i inputs and outputs 09
hex
hex
hex
(no outputs, 1 byte input)
6.1.2 Standard diagnostic object
Verification if the module has an error on the AS-i side or if it functions without
error�
Read standard diagnostic object request
Byte no. Description
UK
0 Command code 16 = read standard
1 Index 1 = ID object
2 Length to be read = 1
Read standard diagnostic object reply
Byte no. Description
0 Command code 80 = read standard OK
1 Standard diagnostic code:
00
= no error
hex
01���05 see chapter 6�5
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RS-485 gateway
6.2 Exchange device parameters
Write device parameters
Request write device parameters
byte no. Exchange requirement
0 Command code 19 = write
1 Index = 2 (parameter)
2 Write length = 4
3 Parameter data 0
4 Parameter data 1
5 Parameter data 2
6 Parameter data 3
Reply write device parameters
Byte no. Exchange reply
0 Command code 83 = data exchange OK
Parameter data see chapter 6�4
Read device parameters
Read devices parameter reply
Byte no. Exchange requirement
0 Command code 18 = read standard
1 Index = 2 (parameter)
2 Reading length = 4
Read device parameters reply
Byte no. Exchange reply
0 Command code 82 = data exchange OK
1 Parameter data 0
2 Parameter data 1
3 Parameter data 2
4 Parameter data 3
Parameter data see chapter 6�4
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6.3 Exchange serial data
Write serial data
Write serial data reply
Byte no. Exchange reply
0 Command code 19 = write
1 Index = 3 (serial data)
2 Write length (1���32)
RS-485 gateway
3���34 Data to be sent (length corresponds to byte
Write serial data answer
Byte no. Exchange reply
0 Command code 83= data exchange OK
Read serial data
Read serial data request
Byte no. Exchange reply
0 Command code 18= read
1 Index = 3 (serial data)
2 Read length = 1���32
Read serial data answer
2)
UK
byte no. Exchange reply
0 Command code 82 = data exchange OK
1���32 received data
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6.4 Data structures
Diagnostics Description
0 good
>0 error
Parameter data 0 Description
0 reserved
Parameter data 1 Description
0 reserved
Parameter data 2 Description
0 1200 baud
1 2400 baud
2 4800 baud
3 9600 baud
4 19200 baud
5 38400 baud
>5 reserved
Parameter data 3 Description
XXXXXX00
XXXXXX01
XXXXXX10
XXXXX0XX
XXXXX1XX
XX00XXXX
XX01XXXX
bin
bin
bin
bin
bin
bin
bin
no parity
odd parity
even parity
1 stop bit
2 stop bits
8 data bits
7 data bits
Error code Description
0 no error
1 illegal index
2 illegal length
3 request not implemented
4 busy
(request was not executed within time frame;
please try again later)
5 last acyclic request not acknowledged
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RS-485 gateway
UK
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