The X520 provides 4 non-isolated RS-232 serial ports, 1 digital input channel and 2 digital output channels. It equips 16 bytes hardware FIFO for each port, offers speed up to 115.2K bps and supports full-duplex communication.

Number of ports	4
Interface	TxD, RxD, GND
Controller	16C550 compatible
	Speed: 115200 bps Max.
	Data bit : 5, 6, 7, 8
	Stop bit : 1, 1.5, 2
	Parity : None, Even, Odd, Mark, Space
	FIFO : Internal 16 bytes
Bus	Parallel I/O Module
Connector	14-Pin Removable Terminal Block
Isolation Voltage	Non-isolated
Software
Support interrupt driven software library
Support VxCOM library
Digital Output
Output Channels	2
Output Type	Open-collector (Sink)
Stop bit	+5 ~ +30 VDC
Max Load Current	100 mA/channel
Isolation Voltage	Non-isolated
Digital Input
Input Channel	1
Input Type	Source, Dry
On Voltage Level	+1 VDC max or connect to GND
Off Voltage Level	+3.5 V ~ +30 VDC or Open
Isolation Voltage	Non-isolated
Power requirement
+5 VDC
Environment
Operating Temperature	-25°C ~ +75°C
Storage Temperature	-30°C ~ +80°C
Relative Humidity	10 ~ 90% RH, non-condensing
Dimensions
64 mm x 38 mm