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Unidrive SPM User Guide
107
Issue Number: 3 www.controltechniques.com
Disabling User Security
Unlock the previously set security code as detailed above. Set Pr
0.34
to
0 and press the
button. The User Security has now been disabled,
and will not have to be unlocked each time the drive is powered up to
allow read / write access to the parameters.
7.10 Displaying parameters with non-
default values only
By entering 12000 in Pr
xx.00
, the only parameters that will be visible to
the user will be those containing a non-default value. This function does
not require a drive reset to become active. In order to deactivate this
function, return to Pr
xx.00
and enter a value of 0.
Please note that this function can be affected by the access level
enabled, refer to section 7.9
Parameter access level and security
for
further information regarding access level.
7.11 Displaying destination parameters only
By entering 12001 in Pr
xx.00
, the only parameters that will be visible to
the user will be destination parameters. This function does not require a
drive reset to become active. In order to deactivate this function, return
to Pr
xx.00
and enter a value of 0.
Please note that this function can be affected by the access level
enabled, refer to section 7.9
Parameter access level and security
for
further information regarding access level.
7.12 Serial communications
7.12.1 Introduction
The Unidrive SP has a standard 2-wire EIA485 interface (serial
communications interface) which enables all drive set-up, operation and
monitoring to be carried out with a PC or controller if required. Therefore,
it is possible to control the drive entirely by serial communications
without the need for a SM-keypad or other control cabling. The drive
supports two protocols selected by parameter configuration:
•
Modbus RTU
•
CT ANSI
Modbus RTU has been set as the default protocol, as it is used with the
PC-tools commissioning/start-up software as provided on the CD ROM.
The serial communications port of the drive is a RJ45 socket, which is
isolated from the power stage and the other control terminals (see
section 6.16
Serial communications connections
for connection and
isolation details).
The communications port applies a 2 unit load to the communications
network.
USB/EIA232 to EIA485 Communications
An external USB/EIA232 hardware interface such as a PC cannot be
used directly with the 2-wire EIA485 interface of the drive. Therefore a
suitable converter is required.
Suitable USB to EIA485 and EIA232 to EIA485 isolated converters are
available from Control Techniques as follows:
•
CT USB Comms cable (CT Part No. 4500-0096)
•
CT EIA232 Comms cable (CT Part No. 4500-0087)
When using one of the above converters or any other suitable converter
with the Unidrive SP, it is recommended that no terminating resistors be
connected on the network. It may be necessary to 'link out' the
terminating resistor within the converter depending on which type is
used. The information on how to link out the terminating resistor will
normally be contained in the user information supplied with the
converter.
7.12.2 Serial communications set-up parameters
The following parameters need to be set according to the system
requirements.
This parameter defines the communications protocol used by the 485
comms port on the drive. This parameter can be changed via the drive
keypad, via a Solutions Module or via the comms interface itself. If it is
changed via the comms interface, the response to the command uses
the original protocol. The master should wait at least 20ms before send a
new message using the new protocol. (Note: ANSI uses 7 data bits, 1
stop bit and even parity; Modbus RTU uses 8 data bits, 2 stops bits and
no parity.)
ANSIx3.28 protocol
Full details of the CT ANSI communications protocol are the
Advanced
User Guide
.
Modbus RTU protocol
Full details of the CT implementation of Modbus RTU are given in the
Advanced User Guide
.
Modbus RTU protocol, but with an SM-Keypad only
This setting is used for disabling communications access when the SM-
SM-Keypad is used as a hardware key. See the
Advanced User Guide
for more details.
* only applicable to Modbus RTU mode
This parameter can be changed via the drive keypad, via a Solutions
Module or via the comms interface itself. If it is changed via the comms
interface, the response to the command uses the original baud rate. The
master should wait at least 20ms before sending a new message using
the new baud rate.
When using the CT EIA232 Comms cable the available baud rate is
limited to 19.2k baud.
Used to define the unique address for the drive for the serial interface.
The drive is always a slave.
Modbus RTU
When the Modbus RTU protocol is used addresses between 0 and 247
are permitted. Address 0 is used to globally address all slaves, and so
this address should not be set in this parameter
ANSI
When the ANSI protocol is used the first digit is the group and the
second digit is the address within a group. The maximum permitted
group number is 9 and the maximum permitted address within a group is
0.35 {11.24}
Serial mode
RW
Txt
US
Ú
AnSI (0)
rtU (1)
Ö
rtU (1)
Comms value
String
Communications mode
0
AnSI ANSI
1
rtU
Modbus RTU protocol
2
Lcd
Modbus RTU protocol, but with an SM-
Keypad only
0.36 {11.25}
Serial communications baud rate
RW
Txt
US
Ú
300 (0), 600 (1), 1200 (2),
2400 (3), 4800 (4), 9600 (5),
19200 (6), 38400 (7),
57600 (8)*, 115200 (9)*
Ö
19200 (6)
0.37 {11.23}
Serial communications address
RW
Txt
US
Ú
0 to 247
Ö
1
NOTE
