User's Manual

CHAPTER3
CommunicatingwiththeRTU
15
• Battery, which enables powering external circuits. The maximum
current drawn by the attached circuit must not exceed 500 mA.
• RxD and TxD, which are used for serial communication (19200
bau
d) with the A753. The pinout of the POWER connector is
shown in Figure 6.
Figure 6. The POWER connector
 WARNING The serial communication line is 3V CMOS compatible. Therefore, a
special adapter cable must be used to reach the RS-232 levels.
You might want to charge the A753 with something other than the
standard
solar panel. In this case you must provide the electrical
characteristics and configuration shown in Figure 7.
Figure 7. Configuration for charging the A753
Note: The Charger must have a current limited output of 300mA max! A
standard wall adapter will not fit this need! See also Table 3 on
page 14.
CommunicatingwiththeRTU
You can use a terminal program (like Windows Hyperterm) to connect
to the A753 RTU. After you have installed the system, follow these
steps to configure the device and set the default parameters:
Note: To configure the A753, you must have a special adapter cable (item
number 200
.720.542 from your Adcon distributor).
1. Plug the round connector into the POWER connector of the RTU.
2. Plug the USB connector into your PC’s USB jack.
3. If you are using the serial cable the first time, please follow the
instructions to install the driver.