Owner`s manual

M SERIES DAC
BASE UNIT AND MODULE OPERATION
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number, module number, and port number. Messages are sent only to the designated
host module in immediate reporting mode. The factory default host module location
is Unit 1, Module 1, Port 1.
V74/V75/V87 PORT ID
The Port ID feature allows a user to enable or disable the Port ID for individual I/O
ports. When Port ID is enabled, a port identification code proceeds data sent to the
host computer when using Immediate and Command Reporting modes. The Port ID
can consist of the Unit Number:Module Number,Port Number corresponding to the
I/O port that received the data. The Port ID can also consist of the Device Name
assigned to the I/O port in the configuration mode. The factory default Port ID is
enabled and has the UU:MM,PP format.
V74/V75/V87 THE MESSAGE TERMINATING CHARACTER
The message terminating character is a single character that indicates a complete
message has been received in immediate and command reporting modes. Data is held
in the buffer of the M Series unit until the terminating character is received from the
connected peripheral device which defines a complete message. The complete
message is eventually sent to the host device depending on the mode of operation.
The message terminating character can be programmed to be any two-digit
hexadecimal character from 00 Hex to 7F Hex. The factory default message
terminating character is 0D Hex <cr>.
V74/V75/V87 MODES OF OPERATION
This section briefly describes the three programmable modes of operation. The
default mode of operation is full duplex mode.
FULL DUPLEX MODE
Full duplex mode increases input/output by interfacing the host module to four
peripheral devices for each module. The host system selects a specific port by
sending a port select sequence. The host system remains connected to the selected
port until another port is selected. Data received by non-selected ports are stored in a
buffer until the port is selected or a clear buffer command is sent.
IMMEDIATE MESSAGE MODE