Справочник Пользователя для CALAMP WIRELESS NETWORKS INC. BDD4T83-2

The RS-232 LEDs normally indicate port activity
on the port selected. See section 3.2.1.4 above for
instructions for selecting display mode.

Command Mode - LED lights and re-
mains lit while the selected port is ac-
cessing the Command Processor. It lights
ON and OFF while being configured.

Flow Control on Receive - the BDLC

PD

has received a flow control signal from
the device connected to it. When it lights,
BDLC

PD

 has stopped sending data to the

DTE. When LED goes out, the port ter-
minal is again ready to receive data.

Flow Control on Transmit - the BDLC

PD

has sent a flow control signal to the DTE
asking it to stop sending data. The LED
remains lit as long as the terminal is be-
ing held off.

Receive Data - when lit, it shows that the
Receive Data pin 3 on the RS-232 inter-
face connector is active. Since all
BDLC

PD

 are configured as DCE, it means

that the DTE is receiving data from the
BDLC

PD

.

Transmit Data - shows the status of
Transmit Data pin 2 of the RS-232 inter-
face. When lit, the DTE is sending data
to the BDLC

PD

.

Check:

Normally flashing rapidly (about 6 cps),
indicates microprocessors are working
correctly and power is applied.

Not flashing indicates unit is not
functioning.

Blinking slowly (1 cps), indicates the pa-
rameters contents of the flash memory have
been corrupted. The unit automatically loads
its set of factory default parameters and
starts beeping at 20 seconds intervals.

May also indicate DSP-modem re-
initialization has occurred

All alarm conditions will cause the BDLC

PD

 to

light one or more of the LED indicators. LEDs
remain ON when lit until cleared by either
pressing PF 1 (without affecting operation of the
unit) or RESET (cycling unit OFF and ON).

Local Minor Alarm - when lit, indicates
the presence of any of the following mi-
nor faults:

- Parity, framing or overrun error at any
RS-232 port.

- Out of buffers. No memory available to
accept data from a local terminal device.
Usually denotes a flow control problem.

- Flash memory error. At power-up or
reset, the unit detected a change in non-
volatile memory.

Remote Minor Alarm - when lit, indi-
cates any of the Local Minor Alarm
listed above have taken place at the re-
mote end of the link (i.e. the mobile the
local base station is currently communi-
cating with). It will also light when a
protocol error has been detected on the
network.

In a network using the “Host Link Ac-
tive” (MSC) feature, the RM LED,
flashing in-sync with the CK LED, indi-
cates that the link is down.

Link Failure - when lit, indicates that the
base station fails to receive an ACK for a