TF1100-EC/EI Manual
63
Function sign & can add up to 6 basic commands (Prefix P is allowed) together to form a
compound command sent to the flowmeter together. The flowmeter will answer
simultaneously. Fox example, if No.4321 flowmeter is requested to simultaneously return:1)
instantaneous flow(flow rate), 2) instantaneous velocity, 3) positive total flow, 4) total heat
flow, 5) AI1 analogous input current valve and, 6) AI2 analogous input current value with
check, the following command is issued;
W4321PDQD&PDV&PDI+&PDIE&PBA1&PAI2(CR)
Simultaneously returned data are likely as follows;
+0.00m3/d!AC(CR)
+0.00m/s!88(CR)
+10m3!F7(CR)
+0.0GJ!DA(CR)
+7. 00mA!59
+3. 01!8E(CR)
4. RS485 COMMUNICATION PROTOCOL AND THE USE
On mainboard, there are two Communications short-circuit piece, plug them to RS485
position.
The baud rate of asynchronous communication (Primary station: computer system;
Secondary station: ultrasonic flowmeter) is generally 9600bit/s. A single byte data format
(10 bits): one start bit, one stop bit and 8 data bits. Check bit: none.
Connect the “RS485 A B” two wiring terminals from mainboard to PC.
4. 1 Protocol Select
TF1100 series flowmeter can’t suport protocol 0 and protocol 1 at the same time, in Menu
+6, select protocol 0 or protocol 1.
When use RS485 for communication, select protocol 1 in menu +6.
4.2 Communication commands
4.2.1 Asynchronous communication
(Master station: computer system; Slave station:
ultrasonic flow meter).
4.2.2 Baud rate is usually 9600 bit/s.
4.2.3 Single byte data format (10 bit)
4.1.3.1 start code: one bit.
4.1.3.2 stop code: one bit.
4.1.3.3 redundancy check code: no redundancy check.
4.1.3.4 digital codes: eight bits.
4.2.4 Gating Signal of Master station
4.2.4.1
Format of Gating Signal
* Slave station NO. Command from Master Station to Slave Station
①
②
③
