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130 UDC 6300 Process Controller Product Manual 1/03
4.14 Communications Set Up Group, Continued
Table 4-13 Communications Group Definitions, continued
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
FRAMING
422ASCII, 485MODRTU
only
DEFAULT
100MSEC
50MSEC
25MSEC
10MSEC
FRAMING —Used with asynchronous block
communication including ASCII and Modbus RTU. This
prompt allows selection of maximum allowable time
between transmitted characters before the received
message is terminated. Typically, this parameter should be
set to DEFAULT, but additional adjustment may be
required when the Host (PC) communication driver has
gaps that exceed the normal allowable delay.
DEFAULT Modbus framing is based on the baud rate as
3-1/2 character times.
DEFAULT ASCII framing is infinite time delay between
characters. Messages are only terminated when a LF,CR
is received.
100MSEC—100 milliseconds
50MSEC—50 milliseconds
25MSEC—25 milliseconds
10MSEC—10 milliseconds
XMT DELAY
NONE
10MSEC
20MSEC
30MSEC
40MSEC
50MSEC
TRANSMISSION DELAY—Provides a means for delaying
the response from the UDC after a valid message has
been received. It allows hot computers that operate in half
duplex to post a receive after the end of a transmission. It
is also used in cases where the two wire RS232/485
adapter requires a delay for shutting down its drivers after
transmission.
NONE—No transmission delay
10MSEC—10 milliseconds
20MSEC—20 milliseconds
30MSEC—30 milliseconds
40MSEC—40 milliseconds
50MSEC—50 milliseconds
DUPLEX
Does not apply to
485TDCSDI
HALF
FULL
DUPLEX – Transmission Response
HALF
Delayed Response
FULL
No Delayed Response
DATA FORM
485MODRTU only
INTEGER
FLOAT PT
DATA FORM Transmission Data Format
INTEGER
Process-related data in 16-bit Integer format
FLOAT PT
Process-related data in IEEE Floating Point
format
UNITS
PERCNT
ENG
COMMUNICATION UNITS — This selection determines
how the controller values are expressed during
communications.
PERCENT OF SPAN
ENGINEERING UNITS
Table 4-13 continued on next page
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