120 20170-204a
Paragon
PD
Technical Manual
16
LF
Link Failure - when lit, indi-
cates that the base station fails to re-
ceive an ACK for a packet sent and for
all subsequent retries. Some data has
possibly been lost. LF is not functional
if all active ports are set to NAR mode.
Link fails are inevitable during normal
operation (mobiles temporarily out of
range, in a tunnel, parked in a dead spot,
etc.). A lit LF LED is not normally
cause for concern.
UF
Unit Failure - when lit, the unit requires
attention:
- The BDLC
PD
is not operable;
It may indicate detection of a system
software error trap.
- The BDLC
PD
is operable;
Indicates that on power-up, invalid data
was detected in the serial EEPROM
chip (located in the radio modules). It
may also indicate that connection to the
radio modules is incorrect or that radio
power is not applied.
The LM, RM and UF alarms also sound a beep
when a fault occurs. The LF alarm is silent.
3.2.2 BDLC
PD
Rear panel
Referring to Figure 4, the rear panel of the
BDLC
PD
has the following set of chassis con-
nectors:
•
Four DE-9F connectors:
–
DEV2 - usually connected to Datara-
dio’s WinRIS program (DMP/Setup
19200). Can also be used with special
user’s application such as telephone
modem.
Note: connection to a tele-
phone requires the use of a DCE Cross-
over cable.
–
DEV3 - Dedicated (9600)
–
DEV4 and DEV5 - not used
•
One DB-25F connector
-
DEV1 - Connects to user’s application.
a)
DMP 19200 for single-site installa-
tions
b)
MSCP 19200 for multi-site installa-
tions
•
One DA-15M connector:
-
DEV6 Digital I/O - not used
•
One DB-25M connector:
-
EXT RADIO/TEST - connects to the
Radio assembly (see Figure 15)
3.2.2.1 Signal
Levels
In the description of data signals in Table 7, the
following conventions are used:
Table 5 - RS-232 Signal levels
Term
Alternates
Signal level
ON
Asserted, spacing
+3 to +15 V
OFF
Dropped, marking
-3 to -15 V
3.2.2.2 Pin
Functions
Table 6 - DTE Port 9-pin funtions
DE-9 F
pin #
Function (RS-232 signal levels)
1
DCD – from Paragon
PD
, normally asserted
2
RXD – data from Paragon
PD
3
TXD – data to Paragon
PD
4
DTR – to Paragon
PD
, handshaking
5
Ground
6
DSR – from Paragon
PD
, tied to VCC through
current limiting resistor
7
RTS - to Paragon
PD
, handshaking
8
CTS – from Paragon
PD
, handshaking
9
Reserved
Table 7 - DTE Port 25-pin functions
DB-25F
pin #
Function (RS-232 signal levels)
1 and 7
Ground
2
TXD – data to BDLC
PD
3
RXD – data from BDLC
PD
4
RTS – to BDLC
PD
, must be asserted
5
CTS – from BDLC
PD
, handshaking
6
DSR – from BDLC
PD
, 8V
8
DCD – from BDLC
PD
, always asserted
9
RI - from BDLC
PD
, always –8V
20
DTR – to BDLC
PD
, handshaking
We recommend the use of shielded 9-wire or
25-wire cables with all pins connected.
Dataradio recommends the use of secure (i.e.
password protected and/or dial-back) modems in
any installation where dialup access is provided.
