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A-4
M
ODEL
10 O
PERATIONS AND
M
AINTENANCE
M
ANUAL
Accu-Sort Systems
M
ESSAGE
F
ORMATS
The standard communications parameters are as follows:
Standard asynchronous data frame (least significant bit first)
7 data bits
1 even parity bit
2 stop bits
If the master can only support 8 bit data plus a parity bit, the format is as follows:
8 data bits
1 odd parity bit
1 stop bit
(Odd parity is required to make sure that the guard character will be all ones with
one for parity.)
You can use any baud rate that is supported by both the master and the slaves.
System performance is usually best when using the highest baud rate possible.
The following is framing for all messages sent by any device on the multidrop
line:
0FFH
STX
ID(2)
TYPE(2)
SEQ DATA LRC(2)
CR
(FFhex) =
Guard Character
This character is "sacrificed" to the line noise that occurs when the unit transmitter is first turned
on. The unit software may (optionally) wait one character time between transmitter enable and
transmission of the STX (the next character). This eliminates transmitting the guard character. The
receiver ignores this character.
STX(02hex) =
Start of text character
This character indicates the start of a message. The receiver should clear any characters in its
receive buffer whenever it receives this character.
ID(2 ASCII digits) =
The unit ID
This field indicates the unit identification number of the unit to which the message is directed, if the
message is coming from the master. This field indicates the unit identification number of the unit
transmitting the message, if the message is from a slave.
A message with an ID of "00" from the master is a broadcast message. All slave units should act
on the message (display data, reset, etc.), but no slave should respond to the message.
TYPE(2 ASCII digits) =
The message type
This field describes the purpose of the message that is sent. There are five message types as
shown below:
Message Types
01
Poll
This message type is sent by the master unit to request data from a slave.
02
Data
This message type is sent by either a master to transfer data to a slave or by a slave to transfer data to
the master after receiving a poll. The TYPE field will then be followed by a SEQ field and a data field.
03
ACK
This message type is sent by the unit that has just received a valid data message.
04
Wake up
This message type is sent by the master. The slave that receives it should acknowledge the message.
05
No data
This message type may be sent by a slave indicating that the slave has no data to send in response to a
poll. This message is optional. If the slave has no data, it may ignore the poll.
SEQ(1 ASCII digit) =
The sequence number
This field starts at zero at power up, and is incremented by one for each data message sent. When
the sequence number reaches nine, it wraps around to one. This field is only present in a data
message.
DATA =
The content of the
data field
This field contains data, if the message type indicates that data is included. This field may contain
no characters (length of zero; poll, acknowledge and wake up messages do not have data fields.)
LRC(2 HEX digits) =
The Linear
Redundancy Check
Sequence
The LRC is computed by exclusive-oring all the characters in the ID, TYPE, SEQ, and data fields,
then converting the hex number into two ascii digits. This mathematical process checks to make
sure that the message is valid.
CR (0Dh) =
Carriage return
This character indicates the end of the message. When this character is received, the unit should
check to see that the message started with a STX, and check that the LRC is correct before
accepting it as a valid message.
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