Publication 1734-UM009A-EN-P - June 2002
Installing the RS-232 ASCII Module 1-13
Operating Mode Selections
The 1734-232ASC module has several different operating modes, some
of which are available only in certain combinations. Major options are
summarized below, with additional details provided in chapter 2.
Transmit Handshake vs. Transmit Immediate Option
This option defines when the 1734-232ASC modules transmits data out
of its serial port.
With Transmit Handshake active (default), the 1734-232ASC
modules keys on the second byte (TX Transaction ID) of the poll
command or explicit message to determine whether or not the
consumed data from the DeviceNet Master is to be transmitted out the
serial port. While this TX ID is static, the module will not transmit the
command data. Upon sensing a change in value of the TX ID byte, the
module transmits the data. It will initiate one serial transmission for
each change in the TX ID value, regardless of the data string value.
In Transmit Immediate mode, the 1734-232ASC module ignores the
TX ID byte value and initiates a new serial port transmission with each
message received from DeviceNet.
These actions take place with either a Poll command or an explicit
message that writes to the consume assembly object or the serial port
object.
TIP
Care should be taken when selecting this option for
I/O messaging. See page 2-24 for details.
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