Owner`s manual

M SERIES DAC
BASE UNIT AND MODULE OPERATION
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Immediate message mode provides multiplexing of all messages from all ports to the
designated host module automatically. Data is buffered until an end of message
terminating character is received or 256 bytes are received. The messages are sent to
the host device and can be preceded by a port identification code corresponding to the
unit, module, and port number or the device name of the peripheral port that sent the
message.
IMMEDIATE DATA MODE
Immediate data mode is similar to immediate message mode described above. The
primary difference is that immediate data mode does not wait for a message
terminating character to send data to the designated host module. Data is sent to the
designated host module automatically, as soon as it is received by any port on the
peripheral communications module.
COMMAND MODE
Command mode provides multiplexing of single messages, all messages, or all
buffered data from specified ports on request from a host computer. When a host
computer sends a data command, the V74/V75/V87 sends a single message, all
messages, or all buffered data from the requested port(s) through the host module.
This information can be preceded by a port identification code corresponding to the
unit, module, and port or the device name of the peripheral port that sent the message.
Complete messages and/or buffered data are sent to the designated host device in a
round-robin fashion.
TIME TAG
The module can be programmed to provide a time tag in immediate or command
operation mode. A time tag provides the month, day, year, hour, minute, and second
the message or block of data was recorded according to the M Series main unit's time-
of-day clock. The time tag is inserted after the port identification code if enabled.
The time tag can appear in one of four formats:
1) HH:MM:SS,
2) HH:MM:SS:mmm,
3) MM/DD/YY HH:MM:SS,
4) MM/DD/YY/ HH:MM:SS mmm
where HH: is the hour, MM: is the minute, SS is the second, mmm is the millisecond,
MM/ is the month, DD/ is the day, and YY is the year of the M-Series time-of-day
clock.