Digi 90000278_B - Manual (Page 18)

18 Digi One EM Hardware Reference
LEDs (CR4 - CR11)
The LED labeled CR4 is a power indicator. The other seven
LEDs display EIA-232 signal activity. The following table
describes the specific signal associated with each LED.
LED Signal
CR5 Tx (Transmit Data)
CR6 Rx (Receive Data)
CR7 CTS (Clear to Send)
CR8 RTS (Request to Send)
CR9 DTR (Data Terminal Ready)
CR10 DSR (Data Set Ready)
CR11 DCD (Data Carrier Detect)