Owner`s manual

M SERIES DAC
BASE UNIT AND MODULE OPERATION
____________________________________________________________________________
136
automatically as soon as it is received by any port on the peripheral communications
module.
Command reporting mode allows the host computer to send commands requesting
messages or buffered data from the ports
Each message or data block sent to the host computer in immediate or command
mode can be preceded by a port identification code consisting of either the unit
number, a colon, the module number, a comma, and the port number or the device
name of the port that received the message. In numeric form, the Port ID can range
from 01:01,1 (for Unit 1, Module 1, Port 1) to 30:16,4 (for Unit 30, Module 16, Port
4). If time tag is enabled, the month, day, year, hour, minute, and second the message
or block of data was recorded are sent in addition to the port identification code.
There are six commands supported by the serial port modules. Two of these
commands can be issued regardless of the operation mode. These are the
$CONFIG<cr> and CBn<cr> commands. The $CONFIG<cr> command instructs the
module to go into configuration mode.
The CBn<cr> command clears the buffer of Port n (n = 1 to 4 or 0 for all ports). You
must select the 4-port serial module from the host module in order to issue the clear
buffer command. This is done by sending the port select code, the appropriate unit
number followed by a colon (1: to 30: - only if using cascaded units), the module
number (2 to 16), and <cr>. You can issue the clear buffer command for multiple
ports by separating the port numbers with a comma. For example, to clear the receive
buffer for Ports 1 through 3 of the selected module, send CB1,2,3<cr>. The other
four supported commands can be issued in command reporting mode only.
OPERATING IN FULL DUPLEX MODE
In full duplex mode, the V74/V75/V87 module provides full duplex communication
between the host module and the selected port. The host module and the selected port
remains connected until a different port is selected or until the host module
disconnects from the module by sending the port select code followed by <cr>. Data
received by non-selected peripheral devices is stored in the buffer and sent to the host
device when the port is selected. The serial port module does not start loading data
from the new port into the host module until the new module number, port number
and terminating character are received.
NOTE: The port select sequence has a ten second timer. The timer starts
when the first character of the port select sequence is received. Any
incomplete sequence received ten seconds or more after the first character