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3.2 Communications Connectors
The communications connectors (CN1-1 and CN1-2) connect the SI-T Card to the commu-
nications lines of the MECHATROLINK-I or MECHATROLINK-II. The following table
shows the pin numbers and their functions.
3.3 LED Indicators
The LED indicators indicate the status of the communications of the MECHATROLINK-I
or MECHATROLINK-II and the SI-T Card.
However, these indicates are for maintenance checks at Yaskawa. Use the Digital Operator
to check the status.
Connector Pin No. Signal Name I/O Function
CN1-1
1(NC) − Not used.
2SRD− I/O Send/receive data (-)
3 SRD+ I/O Send/receive data (+)
4(NC) − Not used.
Shell Shield − Not used.
CN1-2
1(NC) − Not used.
2SRD− I/O Send/receive data (-)
3 SRD+ I/O Send/receive data (+)
4(NC) − Not used.
Shell Shield − Not used.
Name Display Explanation
Color Status
RUN Green Lit Normal operation
− Not lit Communications CPU stopped, resetting hardware, RAM check
error, DPRAM check error, station address setting error, or
Inverter model code error
ERR Red Lit Watchdog timeout error, communications error, diagnosis error, or
resetting hardware
Red Blinking ROM check error (once)*, RAM check error (twice)*, DPRAM
check error (3 times)*, communications ASIC self-diagnosis error
(4 times) *, ASIC RAM check error (5 times)*, station address set-
ting error (6 times) *, Inverter model code error (7 times) *
*: Indicates the number of blinking.
− Not lit No communications error or self-diagnosis error
TX Green Lit Sending data
− Not lit Sending of data stopped, hardware reset
RX Green Lit Searching for receiving carrier
− Not lit No receiving carrier found, resetting hardware
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