Led Indicators - Black Box PC001 User Manual

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 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.
5. LED Indicator
TTX
TRX
TCD
TCTS
ERROR
POWER
MCTS
MCD
MRX
MTX
Terminal Transmit Data
Terminal Receive Data
Terminal Carrier Detect
Terminal Clear To Send
Error Condition
Power On
Modem Clear to Send
Modem Carrier Detect
Modem Receive Data
Modem Transmit Data
CHAPTER 5: LED Indicator
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