Measurement Computing Analyzer488 - Manual (Page 101)

Section 4 Serial Controller
4.7
There are approximately 32 available queues for a total of 4096 bytes of buffer
(character) space. Queues are continually allocated and released as required. Of the
32 available queues, 22 are issued without regard to controlling the receipt of
additional serial input data.
When the serial input buffer requests one of the last 10 queues (1270 character
locations left), it signals the serial host that it should stop sending data. This is
accomplished by either unasserting RTS or issuing "XOFF", depending on which
serial handshake control has been switch selected. When more than 10 queues
become available, it asserts RTS or issues "XON".
4.11 Command Descriptions
The commands for the Serial Controller Mode of the Analyzer488 are described
on the following pages. Commands are listed in alphabetical order. Each command
description is divided into several areas:
4.11.1 Type
The type section of the command description lists the command
group, one of: system command, record command, high level controller
command, or low level controller command.
4.11.2 Syntax
The syntax section of the command description describes the proper
command syntax which must be sent to the Analyzer488 using the IBM
BASIC PRINT# command, or its equivalent in other languages, to the
COM port. The following conventions are used in the syntax descriptions:
No command, along with its options, may be more than 127
characters long. The data part of the OUTPUT command is not constrained
by this length. The OUTPUT #count; data command may be as long
as necessary. Refer to the OUTPUT command description for more
information on this.