USB-87P1/2/4/8 User Manual, version: 1.4
6
Communication
USB interface
The USB-87Pn is equipped with USB communication interface. It requires no converter,
plug and play at run time, very simple and convenient to connect with your PC
.
DCON protocol
The DCON protocol for communicating with I-87K series I/O modules plugged in a
USB-87Pn is a simple command/response protocol. All commands and responses are
in easy used ASCII format.
Rugged Industrial Environment
Dual watchdog design
The I-87K series I/O modules provides module watchdog and host watchdog. The
module watchdog is a hardware watchdog; the host watchdog is a software watchdog.
The module watchdog is designed to automatically reset the microprocessor when the
module hangs. The host watchdog monitors the host controller (PC or PLC). The
output of module can go to the Safe Value state when the host fails.
Programmable power on and Safe Value
Power on value is applied when the USB-87Pn unit is powered on or reset by module
watchdog timeout, while Safe value is applied when host watchdog timeout occurs.
They are programmable for analog and digital channels to prevent unexpected outputs
when a module or a host fails.
Wide range power input (10~30 VDC)
Wide range operating temperature (-25
°
C ~ +75
°
C)
