Black Box PROTOCOL CONVERTER A/S-4 - Manual (Page 20)

CHAPTER 5: LED Indicator
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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.