Control Techniques unidrive sp Advanced User's Manual page 184

Parameter Keypad and Parameter
structure display x.00
Parameter value String
0 AnSI
1 rtU
2 Lcd
ANSIx3.28 protocol
Full details of the CT implementation of ANSIx3.28 are given in Chapter 7 Serial communications protocol on page 360.
Modbus RTU protocol
Full details of the CT implementation of Modbus RTU are given in Chapter 7 Serial communications protocol on page 360.
The protocol provides the following facilities:
• Drive parameter access with basic Modbus RTU
• Drive parameter access via CMP extensions
• Option module internal parameter access via CMP extensions
• Access via an option module onto a network via CMP extensions (see specific Solutions Module User Guides for details)
• Drive parameter database upload via CMP extensions
• Drive Onboard PLC program upload/download via CMP extensions
• The protocol supports access to 32 bit floating point parameters
The following product specific limitations apply:
• Maximum slave response time when accessing the drive is 100ms
• Maximum slave response time when accessing option module internal parameters or via an option module to a network may be longer than
100ms (see specific Solutions Module specifications for details)
• Maximum number of 16 bit registers that can be written to, or read from, the drive itself is limited to 16
• Maximum number of 16 bit registers that can be written to, or read from, a Solutions Module or via a Solutions Module - see Solutions Module
User Guide
• The communications buffer can hold a maximum of 128bytes
Modbus RTU protocol, but with SM-Keypad Plus only
This setting is used for disabling comms access when the SM-Keypad Plus is used as a hardware key. See section 2.6.2 'Hardware key' feature on
page 11 for more information.
11.25 Baud rate
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop, Closed-loop vector, Servo,
Default
Regen
Update rate Background read
Used in all comms modes to define the baud rate.
Parameter value String/baud rate
0
1
2 1200
3 2400
4 4800
5 9600
6 19200
7 38400
8* 57600
9* 115200
*Modbus RTU only
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.
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
Comms mode
ANSIx3.28 protocol
Modbus RTU protocol
Modbus RTU protocol, but only with an LCD keypad
FI DE Txt VM DP ND
1
0 to 9
6
300
600
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Serial comms
Macros
protocol
RA NC NV PT US RW BU
1 1
Electronic Feature look-
Performance
nameplate up table
PS
1
Menu 11
183