Yamatake Corporation
ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
5-65
5-13 : DE Mode Configuration
Procedure
Table 5-3 defines the information that can be transferred with the communication pro-
tocol used in the transmitter digital mode. This section describes how to check and
change the amount of data to be transferred.
Table 5-3 Data element for digital transmission
Data element
Selection
Output signal mode
for digital transmis-
sion
One of the following can be selected:
Single Range: This mode is used to display the PV value for the range that is set in the transmitter
on the TDCS.
Dual Range (STDC): This mode is used to display on the TDCS the PV value in two different
units of measurement, one for full range and another for working range.
Single Range w/SV: This mode is used to display on the TDCS the single range and the sensor
temperature of the transmitter.
Message format for
digital transmission
One of two modes can be selected:
4 bytes:
Byte
1
2
3
4
FLAG
PV
PV
PV
Byte 1: Identification of output signal mode
Byte 2-4: PVs
6 bytes:
Byte
1
2
3
4
5
6
FLAG
PV
PV
PV
ID
DB
Byte 1: Identification of output signal mode
Byte 2-4: PVs
Byte 5: Identification of database being transmitted (LRV, URV, SPAN, etc.)
Byte 6: Data being transmitted.
Note
Transfer rate:
4 bytes
6 bytes
PV value
Approx. 3 times/sec.
Approx 2.5 times/sec.
Sensor temp
Approx. once every 2.5 sec.
Approx. once every 3 sec.
Fail-safe mode for
digital transmission
This fail-safe mode applies to STDC card operations, not to the transmitter.
The two types of fail-safe mode are the STDC card input setting and output setting. The three
directions of burn-out are lower limit, upper limit, and hold.
SFC display
Type of fail-safe
STDC input
F/S = B/O Lo
Lower limit
F/S = B/O Hi
Upper limit
F/S = LKG
(The STDC output signal holds the PV value displayed
immediately before the transmitter error)
STDC output setting
F/S = B/O Lo
Lower limit
F/S = B/O Hi
Upper limit
F/S = LKG
(The STDC output signal holds the PV value displayed
immediately before the transmitter error.)
F/S: Fail Safe
B/O: Burn Out
LKG: Last Known Good Value
FSO: Freeze Slot Output