Campbell Scientific SDM-SIO1 Serial Input/Output Module - Manual (Page 8)

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() instruction in
CRBasic. The SerialOpen() instruction 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. NOTE
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. NOTE
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). NOTE
Miscellaneous information: The SDM-SIO1 does not support auto
baud rate detection nor the use of the serial
port for Modbus, DNP, or general PakBus
communications.
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