Paradise Datacom P300 Series Installation & Operating Handbook page 188

ASYNC PORT FOR ESC OR AUX CHANNELS
The modem has two fully independent data channels, which may be carried over the satellite within
any overhead that is added, these are referred to as the ESC and Aux channels. The shared interface
on this connector allows the use of only one of these channels at a time, and then only in an Async
mode (there is no clock signal on this port). If both ESC and Aux channels are to be used together or
either channel used in a synchronous mode, then the IDR option must be fitted which provides
separate ESC & Aux ports both with clock, data, and octet lines. When the IDR option is fitted the
shared ESC/Aux port on this connector IS DISABLED. The screen dialogue to configure these
channels is described in section 6.6.25 Change, Tx/Rx, ESC/AUX/BA Menu on page 79.
When configured for different services the ESC and Aux channels provide as follows:
In Closed Net Plus ESC mode the ESC channel provides the variable rate async ESC
facility, the Aux channel is not used.
In IBS/SMS modes the ESC channel provides the High Rate Async ESC facility (2400 Baud
at 64kbps) and the Aux channel either the INTELSAT low rate ESC facility (50 Baud at
64kbps) or a variable rate synchronous Aux circuit. However to use the Aux channel in a
synchronous mode the IDR option must be fitted. Without the IDR option, which has
separate ports for ESC & Aux channels, both ESC and Aux channels (ie high rate async
ESC & INTELSAT low rate ESC) cannot be used simultaneously.
In IDR Mode this port is not used, as when the IDR option is fitted separate ESC and Aux
ports on the IDR card replace this shared ESC/Aux port. Refer to the definitions of the
ESC & Aux ports on the 50 way IDR ESC/Aux/Backward Alarm connector on the
following few pages.
SERIAL PORT FOR LOG PRINTING OR EMBEDDED M&C UPDATE
Update the embedded M&C software
See section 10 Boot Code Operation on page 168 for a description of updating the modems
embedded M&C software. The lead described under PC connection below will be required to
connect the modem to the PC.
Log Printing
When the async port is used to print the traffic log, it is set for 9600 Baud, RS232 levels, 8 data bits,
no parity, one stop bit. There are no serial configuration options, although unlike previous products
this port does now support XON/XOFF flow control. The printer carriage is assumed to be 80 columns
wide.
PC Connection
To connect the serial printer port to a standard PC serial port 25 pin D type female [pins for the 9 pin
`AT` serial port are in square brackets], the following connections are required. Modem pin 12 to PC
pin 2 [3], Modem pin 5 to PC pin 3 [2], and Modem pin 13 to PC pin 7 [5]. See `STANDARD LEAD`
below.
STANDARD LEAD
A constellation monitor / serial lead is available from Paradise Datacom, part number M1479.
This lead provides the required connections to a 25 pin D type for a PC connection (for
printing/capturing a log or updating the modems embedded software), and three BNC s for connecting
to a scope for the constellation monitor.
P300H P300 Series Modem Installation and Operating Handbook Page 188