Communications Settings; Communications Specifications - Omron EJ1 User Manual

Communications Settings

7-1

Communications Settings

Parameter Validity
Fixed Values for
Setting Ranges
Automatic Offsetting
of Setting Values
7-1-1

Communications Specifications

190
Communications are programmed on the host computer. Descriptions of com-
munications in this manual are therefore written from the viewpoint of the host
computer. For example, references to reading and writing mean reading data
from the EJ1 to the host computer and writing data from the host computer to
the EJ1.
The EJ1 uses different communications specifications from existing products
to improve communications operability.
The conditions for parameter validity that depended on the model and setting
status no longer apply.
For example, the setting range for the target value is fixed to 1,999 to 9,999,
regardless of the input type. In other words, the setting ranges under the new
specifications will not change based on the input type or related parameters.
For parameters that set ranges with upper and lower limits, the specifications
now allow the upper and lower limits to be reversed.
Refer to 4-1-3 Analog Inputs, 4-3-4 Setting the Set Point, and MV Limiter on
page 77 in Section 4 Basic Units (TC4/TC2) before using the EJ1.
Accompanying changes outlined under Fixed Values for Setting Ranges
above, there are no longer any restrictions in operations for the target value
limiter or target values for changes in the input type. Under the new specifica-
tions, there is also no need to change control output assignments when oper-
ations, such as selecting heating and cooling, are performed.
Refer to 4-2-1 Control Output Assignments, Heating/Cooling Control on
page 69, and 4-3-4 Setting the Set Point in Section 4 Basic Units (TC4/TC2)
before using the EJ1.
Parameter name
Transmission path connection
Communications
Synchronization method
Transmission code
Error detection
Flow control
Retry function
EDU (Port B)
The following communications settings are used.
Parameter name
Unit number 00 to 63
Port B communications 0: CompoWay/F
protocol 1: Modbus
Port B communications 3: 9.6
baud rate 4:19.2
5: 38.4
6: 57.6
7: 115.2 (kbps)
EDU (Port B)
Multipoint
RS-485
Start-stop synchronization
RTU (Remote Terminal Unit)
CRC-16 (Cyclical Redundancy Check)
None
None
Setting range Default
01
0: CompoWay/F Communications or
3: 9.6 (kbps)
Section 7-1
Settings
Setting method
SW1/SW2
SW2
V1.2
Communications or
SW2
V1.2