Phonetics Sensaphone SCADA 3000, User Manual

Page: 116 / 336

modems do not require flow control; as a result, the COM2 configuration jumper may be left
in the STD (standard) position. When flow control is not used, the radio modem will simply
continue to send data until a short period of silence occurs.
Note : Be sure to set each unit’s modbus ID to a unique number BEFORE power-
ing up all of the units on your network.
FLOW CONTROL
COM port flow control is enabled in the SCADA 3000 when the configuration jumper (See
Appendix D) is installed in the Radio position. When flow control is enabled, the unit will
wait until Carry Detect is raised before receiving data. The unit will not transmit data until
the Carry Detect has been dropped. When the unit wishes to transmit data, it will raise the
RTS (request-to-send) line and wait for the CTS (clear-to-send) line to respond. Once this
occurs, the unit will send its data and then drop the RTS line. The RTS hold time (hold after
data sent) may be adjusted by using the SCADA 3000 Register Map Inspector utility from
the
Diagnostics
menu of the SCADA 3000 programming software. Select register 199 “Radio
Timeout.” The RTS hold time default setting is 00 0A, which corresponds to 100ms. To read
the current value of this register, click the Force Read button. To change the value, click the
Force Change
button, enter a new code and click
OK.
A list of valid codes vs. hold times appears
below.
Code Time Code Time
00 00 = 0 ms 00 0A = 100ms
00 01 = 10 ms 00 0B = 110ms
00 02 = 20 ms 00 0C = 120ms
00 03 = 30 ms 00 0D = 130ms
00 04 = 40 ms 00 0E = 140ms
00 05 = 50 ms 00 0F = 150ms
00 06 = 60 ms 00 10 = 160ms
00 07 = 70 ms 00 11 = 170ms
00 08 = 80 ms 00 12 = 180ms
00 09 = 90 ms 00 13 = 190ms
HOST COmPUTeR SeTUP
The radio modem for the host computer connects to an external serial port on the computer.
The radio modem for the host computer must have a transmit frequency that matches the
receive frequency of the SCADA 3000 radio modems. Similarly, the host computer’s radio
modem must have a receive frequency that matches the transmit frequency of the SCADA
3000’s radio modems. Next, you must configure the serial port settings by running the SCADA
3000 software and selecting COMM , then Setup from the main menu of the Sensaphone
Control Center form. The following form will appear.
12-2
SCADA 3000 User’s Manual