Specifications

SDM-SIO1 Serial Input/Output Module

2. Specifications

2.1 Supported Data Rates and Protocols

Data rates and protocols are set up using the SerialOpen command in CRBasic.

The SerialOpen command is discussed elsewhere in this document.

Supported data rates

300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 bits/s

Supported modes of operation

RS-232 (Full duplex and receive only), RS-485 (Half and full duplex), RS- 422

(Half and full duplex). Hardware CTS/RTS flow control is supported in RS-

232 mode, the handshaking lines can also be used as general purpose I/O lines.

Supported data format

8, and 7 bit data size*

none, odd, or even parity

one or two stops bits. *

In 7 bit mode with no parity the user must insure that the characters received

by the SDM-SIO1 have a delay of at least one bit period or greater between

them. This does not affect any other configuration and does not affect

transmissions out of the SDM-SIO1.

Miscellaneous information

• Auto baud rate detection is NOT supported

• Use of the serial port for general PakBus communications is not currently

supported.

Buffer sizes

• Transmit buffer size: 767 Bytes (Buffer from the logger to the sensor)

• Receive buffer size: 2047 Bytes (Buffer from the sensor to the logger)

Both transmit and receive buffers are fill and discard type, i.e. once the

buffers become full no new information is accepted and all further data is

discarded until space is made when the logger requests data from the

SDM-SIO1.