Black Box A/S-4 Manual De Usuario

5.  LED Indicator

The front of A/S-4 enclosure provides 10 light emitting diodes (LED) indicators.  The indicators are
arranged and labeled in the following order, from left to right.

TTX

Terminal Transmit Data

TRX

Terminal Receive Data

TCD

Terminal Carrier Detect

TCTS

Terminal Clear To Send

ERROR

Error Condition

POWER

Power On

MCTS

Modem Clear to Send

MCD

Modem Carrier Detect

MRX

Modem Receive Data

MTX

Modem Transmit Data

TTX

Flashes as data is transmitted by the A/S-4 out the terminal port.

TRX

Flashes as data is received by the A/S-4 from the terminal port.

TCD

Lights when the A/S-4’s input of Carrier Detect is high on the terminal port.  This light
must be on while TRX is flashing for A/S-4 to process received data.

TCTS

Lights when the A/S-4’s input of Clear to Send is high on the terminal port.  This light
must be on for the A/S-4 to transmit data on the terminal port.

ERROR

Error Condition Exists - Memory error, bad received block check, or buffer overflow.

POWER

Lights when the A/S-4 is plugged in and the +5 Volt power supply is ok.

MCTS

Lights when the A/S-4’s input of Clear to Send is high on the modem port.  This light
must be on for the A/S-4 to transmit data on the modem port.

MCD

Lights when the A/S-4’s input of Carrier Detect is high on the modem port.  This light
must be on while the MRX is flashing for the A/S-4 to process received data

MRX

Flashes as data is received by the A/S-4 from the modem port.

MTX

Flashes as data is transmitted by the A/S-4 out the modem port.