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33
S280-77-4
!
SAFETY
FOR LIFE
Digital Communications (cont’d)
Security
Limits
Access
Factory
Code
Write
Read
Scroll
High
Low
Incr
Parameter
Settings
83
0
0
NO
2
0
1
Real-Time Digital Communications
2
Port Handshake (Transmit Disable Delay)
Mode Code
0 = None
1 = Not Applicable
2 = Modem Control (50 mS OFF)
3 = Modem Control (0 mS OFF)
4 = Modem Control (10 mS OFF)
•
The transmit/receive handshaking method allows
adaptability of different types of communication sys-
tem interfaces with the Form 4C control. When using
modes 2 through 4, the handshake out signal is
used as the transmit enable. The handshaking input
signal is ignored.
•
Code 83 and Code 85 affect the bandwidth and effi-
ciency of the communication system. Adjusting
Codes 83 through 85 to the minimum operable
delays, maximizes the efficiency of the communica-
tion system.
•
Mode 0:
No handshaking signals. This mode is used
for direct connection between the Form 4C and a
personal computer. It may also be used with an RTU
for point-to-point applications.
•
Mode 1:
Not applicable. Used for internal purposes
only.
•
Mode 2:
Transmit Enable with 50 millisecond trans-
mit disable delay. This is applicable to the three
available interface cards: fiber optic, user-powered
EIA-232, and 202T modem interface. Mode 2 is used
where a transmit enable (push-to-talk) is required as
part of the handshaking.
Applications include using the transmit enable to key
a radio along with using a fiber-optic ring. Transmit
enable is required for control of the fiber-optic ring.
•
Mode 3:
Transmit Enable with 0 millisecond transmit
disable delay. This application is identical to Mode 2
without transmit disable delay. Mode 3 is used for
fiber optic applications where radio squelching is not
a concern.
•
Mode 4:
Transmit Enable with 10 millisecond trans-
mit disable delay. This application is identical to
Mode 2 but with a 10 millisecond transmit disable
delay. Depending on the communication equipment,
a 10 millisecond transmit disable is adequate com-
pared to 50 milliseconds in Mode 2 and results in a
shorter bandwidth and improved efficiency.
Transmit
Enable
Transmit
Disable
Data
Message
CODE 85
Transmit Enable Delay
Programmable from 0-425 mS
in 1mS increments
CODE 83
Transmit Disable Delay
Selectable at 0, 10, or 50 mS
Access Code 83
Transmit
Handshake Mode
Handshaking
Disable Delay
0
No
Not Applicable
1
Not Applicable
Not Applicable
2
Yes
50 mS
3
Yes
0 mS
4
Yes
10 ms
TABLE 6
Handshaking and Transmit Disable Delay
Summary applicable to Access Code 83
Figure 7.
Data transmission from the Form 4C control to the
communication system for handshaking applica-
tions.