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P300H P300 Series Modem Installation and Operating Handbook Page 184
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 76
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 165 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.