ASDA-A User Manual
Chapter 8 MODBUS Communications
© DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
4th Edition 2005/11/30, HE03
8-5
This parameter is used to set the communication protocol. The alphanumeric characters represent the
following: 7 or 8 is the number of data bits; N, E or O refer to the parity bit, Non, Even or Odd; the 1 or 2 is
the numbers of stop bits.
0303H
Transmission Fault
Treatment
Settings:
0: Display fault and continue operating
1: Display fault and stop operating
This parameter is used to determine the operating sequence once a communication fault has been
detected. If '1' is selected the drive will stop operating upon detection the communication fault. The mode of
stopping is set by parameter P1-32.
0304H
Communication Time
Out Detection
Watch Dog Timer (It is not recommended to change the factory default setting if not
necessary)
Range: 0~20
The factory default setting is set to 0 and it indicates this function is disabled.
When this parameter is set to any value over 0, it indicates that the timer is enabled. The value set in this
parameter is the communication time and the communication time out detection should be completed
within the time. Otherwise, a communication error will occur.
For example, if the value set in this parameter is 5, it indicates that the communication time out detection
will be activated once in five seconds or a communication error will occur.
0305H
Communication
Mode
Communication selection:
Settings:
0: RS-232
1: RS-422
2: RS-485
Multiple communication modes RS232, RS-485, RS-422 cannot be used within one communication ring.
0306H
Communication
Function
Digital Input Contact Control:
Settings: 0~FFFF (hexadecimal number)
The setting of this parameter determines how the Digital Inputs (DI) accept commands and signals.
Input commands or signals through the DI can be either from an external source, through the CN 1
interface connector, or via communication, (RS-232, RS-485, RS-422). If the Digital Input Contact Control
parameter for the DI 1 ~ 8 is set to "0", command is external, and via CN1; if it is set to "1" (decimal number)
the DI signal is via communication. Each of the eight Digital Inputs are accessed individually and can be set
independently of each other. They can be programmed either via the drive's keypad or via communication
and computer UI. If they are programmed via the keypad a hexadecimal number is entered; if programmed
via communication or UI a decimal or hexadecimal number can be used. In both methods of programming,
a single number is used for all eight Digital Inputs. The following example shows how each DI is addressed
and converted to a single decimal or hexadecimal number.
The eight Digital Inputs are noted from the right, DI 1 to left, DI 8 with their desired input command or signal
method, 0 or 1. Once all eight Digital Inputs have been noted this binary number is converted to a decimal
or hexadecimal number and entered into P3-06.
Bit
8 7 6 5 4 3 2 1
Decimal
value 128
64
32
16 8 4 2 1
