Drive Address; Short Commands; Summary Of Control Characters - Emerson Mentor MP Advanced User's Manual

Parameter structure Keypad and display
6.1.5

Drive address

The drive only acts on messages received that contain a drive address if
the whole drive address or drive group address match the whole
address or the group address in the message, or if the address in the
message is 0 (i.e. a global message). Global or group addressing allows
data to be written to more than one drive with one command. The drive
does not give a response to a global or group write message. Although it
is possible to perform a global or group read, this would result in
messages crashing if more than one drive responds to the command.
Message
Drive address
address
7.8 7.8
7.8 7.8
7.8 7.0
7.8 7.0
7.8 0.0
7.8 0.0
6.1.6

Short commands

The following short commands can be used:
NAK Not acknowledge (Ctl U)
This is the same as requesting the value of the last parameter to be read
or written to. The response is the same as for a normal read.
ACK Acknowledge (Ctl F)
This is the same as requesting the value of the parameter after the last
parameter to be read or written to. The response is the same as for a
normal read.
BS Back space (Ctl H)
This is the same as requesting the value of the parameter before the last
parameter to be read or written to. The response is the same as for a
normal read.
STX Start of text (Ctl B)
M1
Menu number: 1
M2
Menu number: 2
P1
Parameter number: 1
P2
Parameter number: 2
st
D1
Data: 1 digit
nd
D2
Data: 2 digit
-
-
Dn Data: nth digit
ETX End of text (Ctl C)
Checksum
Writes to the specified parameter at the same drive address as used by
the last read or write.
All the short commands will only read from the drive or write to the drive
if a valid address has already been sent to the drive in a previous
command. The address is registered as being valid once a read or write
command has been completed provide the address was valid for the
drive even if the parameter does not exist. The valid address is
cancelled if a message is received for a non-valid address or one of the
following occurs:
1. The command is aborted because a non-numerical value is received
in the drive address, menu or parameter numbers.
Mentor MP Advanced User Guide
Issue Number: 1
Parameter description
Parameter x.00
Command Action
Read Read
Write Write
Read Read
Write with no
Write
response
Read Read
Write with no
Write
reponse
st
digit
nd
digit
st
digit
nd
digit
www.controltechniques.com
Advanced parameter
format descriptions
2. The command is aborted because the two digits for drive address 1
digit, drive address 2
not the same as each other.
3. EOT is received.
4. A character other than NAK, ACK, BS or STX is sent as a short
command.
5. A character other than ENQ is sent at the end of a read command.
6.1.7

Summary of control characters

STX Start of text
ETX End of text
EOT End of transmission
ENQ Enquiry
ACK Acknowledge
BS Back space
NAK Not acknowledge
Serial comms
protocol
nd
digit, menu number or parameter number are
ASCII code
02
03
04
05
06
08
15
Performance
st
Ctl code
B
C
D
E
F
H
U
189