1. second display interface: serial RS232;
2. communication interface: RS232/RS485, baud rate 600~115200 (optional);
3. built-in rechargeable battery, real-time voltage monitoring ;
4. built-in clock: display and print the date and time;
5. support for multiple print format;
6. printing interface: shared with serial interface, can be connected to serial printer (optional: desktop/thermal printer);
7. relay output: 4 solid state relays (optional: sound and light alarm);
8. communication interface: D-SUB interface, 3 RS232, 1 RS485, 1 USBCOM;
9. can be connected to PC/DCS/PLC.