4-20mA Loop Transmitter PCB

The I-SYS 4-20mA loop transmitter PCB is user configurable. User configurable setpoint1 &setpoint2 values can be entered into the controller using the keypad & seven segment display.The controller will deliver linear current output from setpoint1 load value (4mA) to setpoint 2 load value (20mA). Make sure that the setpoint2 value is greater than setpoint1 value. The 4- 20mA loop transmitter (DAC) PCB receives weight data from R5.0v1 weighing scale PCB as serial UART data. The DAC PCB can be configured to 2400 or 9600 bauds in 8N1 format. The data output speed from R5.0V1 PCB is 10 data samples per second. During normal operation, the display connected to the DAC PCB will show the serial weight data received from the R5.0V1 PCB. During a fault condition, the DAC PCB may report any of the two types of error. The loop error led will be lit when the current loop is open. To reset this error indication, press key K4. The communication error LED will be lit when no communication or UART DATA is received by the loop controller to update the DAC IC. This LED will automatically be reset upon reception of UART DATA.
To configure the machine, connect the power supply. Now press key (K4) and with the key (K4) pressed power on the DAC PCB. Make sure that the weighing PCB (R5.0V1) is already powered up and transmitting the UART DATA. The default baud rate of the weighing PCB supplied with the DAC PCB is 9600 BPS.