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48 Digitax ST User Guide
Issue: 5
5.9.2 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 given in 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 Plus only
This setting is used for disabling communications access when the -
Keypad Plus 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 20 ms before sending a new message using
the new baud rate.
When using the CT EIA232 Comms cable the available baud rate is
limited to 19.2 k 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
9. Therefore, Pr 0.37 is limited to 99 in this mode. The value 00 is used
to globally address all slaves on the system, and x0 is used to address
all slaves of group x, therefore these addresses should not be set in this
parameter.
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
2Lcd
Modbus RTU protocol, but with an
Keypad Plus 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
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