ICP DAS USA PDS-220F Series User Manual page 44

Programmable Serial-to-Fiber Device Server
M1: Slave Mode (Single-echo, Non-shared)
M1 is used for Virtual COM and TCP/IP connections. In this mode, data is transmitted to the specific
client that requested the service. If the client does not send a request to the COM port of the 220Fx,
then the module won't return any data to it.
Condition 1: One client sends a request to the PDS-220Fx to access a device. The PDS-220Fx
transmits data from the device to the client that requested the service.
Condition 2: No clients send any requests to the PDS-220Fx. The PDS-220Fx doesn't transmit any
data from the device to any client.
PDS-220Fx Series User Manual Version 1.3, Oct. 2018 - 44 -