![Serial Serial](/uploads/1/2/6/2/126262568/993426746.jpg)
108 Relays - K108 Controller Pro version: Dec 6, 2015. This is a DIY kit for a serial I/O module with 8 relais outputsand 4 optically isolated inputs.
The SDM-SIO4A connects to multiple remote serial devices using industry-standard hardware that can be set to true RS-232, RS-485, or RS-422 signal levels. When operating in RS-232 mode, the channel also supports hardware handshaking. RS-422 mode is functionally the same as RS-485 mode, except the connection is limited to a point-to-point system. Connections and programming for RS-422 are otherwise identical to RS-485.
The SDM-SIO4A will accept serial data up to 6143 bytes and store it in its buffer. This allows remote equipment to transmit large amounts of data without needing to stop other processes in the data logger.
Up to three SDM-SIO4A modules can be connected to a single data logger using the SDM port, allowing a user to connect 12 different serial devices to a data logger with ease. This is in addition to any connections made to the data loggers via other serial ports.
The SDM Jumper Wire Kit (pn 32505) connects up to four SDMs to the data logger. This kit is recommended when multiple SDMs are connected to one data logger or for extremely short distances between the SDM and data logger. The CABLE5CBL-L cable is recommended for connecting a single SDM to the data logger, and for longer distances between the SDM and data logger.