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• Connector: D-sub 9-pin
Connection: RS-232C
Host computer
Shielded
wire
D-sub 9-pin connector
• When connecting PLC (RS-485)
Connection: RS-485
PLC
FG
Shielded wire
Connect only one side of the shielded wire to the FG or GND terminal so that current cannot flow to the
shielded wire. (If both sides of the shielded wire are connected to the FG or GND terminal, the circuit
will be closed between the shielded wire and the ground. As a result, current will run through the
shielded wire and this may cause noise.) Be sure to ground FG and GND terminals.
Terminator (Terminal resistor)
Do not connect terminator with the communication line because each KT2 has built-in pull-up and
pull-down resistors instead of a terminator.
If there is a large distance between the PLC and the KT2, connect the terminator on the PLC side.
(Connect a terminator of 120
Setup of the KT2
• It is necessary to set the instrument number individually to the KT2 when communicating by connecting
plural units with serial communication.
Select a communication speed of KT2 in accordance with that of the host computer.
• F or instrument number setting and communication speed selection, refer to Chapter "1. Setup of the KT2" or
the instruction manual for KT2.
Memory capacity of the KT2
The memory can contain up to 1,000,000 (one million) set value entries. This memory capacity is
sufficient when the set value is changed by keypad operation. However, when changing the set value
via the communication function, be careful not to exceed the 1,000,000 (one million) capacity limit.
When Lock 1 or Lock 2 is used, every time the set value is changed by the communication function,
the changed value is written in the non-volatile memory. If the value changed by the communication
function is the same as previous one, then it is not written in the non-volatile memory.
When Lock 3 is used and if the set value is changed, the changed value is not written in the non-volatile
memory until the power to the controller is turned off. This has no relation to the limit for changes in set value.
Therefore, be sure to use Lock 3 when changing the set value frequently via communication function.
SV2 of the KT2.
If communication function is applied to KT2, SV2 cannot be set by the command.
RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
FG
(Fig. 4-2)
RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
Shielded wire
(Fig. 4-3)
or more resistance.)
FG
Shielded wire
FG
KT2
FG
3
KT2
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