Communication Cards
3-4 Rev 2/01
Table 3-1. Communications Cards LED Indicators
LEDs STATUS AND ACTIVITY
AA
The AA is the automatic answer indicator LED light. An incoming modem
transmission lights this indicator.
DCD The DCD data carrier detect LED lights when a valid carrier tone is detected.
DTR
The DTR data terminal ready LED lights when a signal from the processor
specifies the device is ready to answer an incoming transmission. When the DTR
goes off, a connected device disconnects.
OH
The OH is the off hook indicator LED light. A dial tone has been detected and the
telephone line is in use by your modem when OH is lit.
RTS The RTS ready to send LED lights when a signal from the processor specifies the
modem is ready to transmit.
RXD The RXD receive data LED blinks when the receive signal is being received from
the communications card. The LED is on for a space and off for a mark.
TXD The TXD transmit data LED blinks when transmit signal data is being received
from the processor. The LED is on for a space and off for a mark.
3.3.1.1 Power Cycling
This function is available with the EIA-232 communications card to provide power savings when using
a radio or cell phone for communications. Power cycling control is accomplished through Power
Control Terminals or the DTR signal on the EIA-232 communications card. Connect wiring as
described in Section 3.5.1. Configure power cycling using the Radio Power Control feature as
described in the ROCLINK User Manual.
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