- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Appendix C - Hardware Installation Guide / C-17
IDLE (Red) - the CPU has free time at the end of its execution cycle and may be overloaded
TX1, TX2, TX3 (Red) - transmit activity on COM1, COM2 & COM3 (respectively)
RX1, RX2, RX3 (Red) - receive activity on COM1, COM2 & COM3 (respectively)
Six Status LEDs (Red) - provide run time status codes (see Table C-7 and Figure C-13)
Normally, the Idle LED should be ON most of the time (unless disabled). When the Idle
LED is OFF, it indicates that the CPU has no free time, and may be overloaded.
Ethernet Port Connector J1 on the CPU/System Controller Board contains two LEDs that
indicate transmit (yellow) and receive (green) activity when lit.
Operation and diagnostic messages are posted to the six Status LEDs (see Figure C-13 and
Table C-7) and, if present, to the optional LCD Display (see Table C-7).
Figure C-13 - CPU/System Controller LED Board - LED Hexadecimal Codes
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