280
Water-resistant Terminals
Section 5-4
Communications Mode Settings
The following communications modes are set with pin 3 of the DIP switch as
shown below.
Note
Make sure that the communications mode of the Slave is the same as that of
the Master Unit. If the communications modes are not the same, normal com-
munications with the Master Unit will not be possible. The operating status of
the Slave can be verified with LED indicators. Refer to
Hold/Clear Outputs for Communications Error
Pin 4 is used to set the output data status when a communications error
occurs, as shown in the following table.
Internal Circuits
SRT2–OD04CL and SRT2–OD08CL
The following diagram shows the internal circuits for the SRT2-OD04CL and
SRT2-OD08CL.
Pin 3
Communica-
tions mode
Communica-
tions distance
Communica-
tions baud rate
Communica-
tions cycle time
OFF
High-speed Com-
munications
Mode
100 m max.
750 kbps
0.5 or 0.8 ms
ON
Long-distance
Communications
Mode
500 m max.
93.75 kbps
4.0 or 6.0 ms
Pin 4 (HOLD)
Output setting
OFF
Clear output status.
ON
Maintain output status.
Photocoupler
External power
supply connector
Output connector 0
Output connector 1
CompoBus/S
communications
connector
Photo-
coupler
Inter
nal circuitr
y
ST