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SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules
5.
Specifications
5.1
Supported Data Rates and Protocols
4
Data rates and protocols are set up using the SerialOpen() instruction in
CRBasic. The SerialOpen() instruction is discussed in Section 6.3.1.1,
SerialOpen
.
(p. 16)
Supported data rates:
Supported modes of operation: RS-232 (full duplex and receive only)
Supported data formats:
Miscellaneous information:
Buffer sizes
Transmit buffer size:
Receive buffer size:
300, 1200, 2400, 4800, 9600, 19200, 38400,
57600, and 115200 bits/s
RS-485 (half and full duplex)
RS-422 (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.
8, 7-bit data size*; none, odd or even parity;
one or two stops bits
* In 7-bit mode with no parity, the user must
ensure that the characters received by the
SDM-SIO1A have a delay of at least one bit
period between them. This does not affect
any other configuration and does not affect
transmissions out of the SDM-SIO1A.
The SDM-SIO1A does not support auto baud
rate detection or use of the serial port for
general PakBus® communications. Modbus
and DNP3 communications are supported.
767 bytes (buffer from the datalogger to the
sensor)
6143 bytes (buffer from the sensor to the
datalogger)
Both transmit and receive buffers are fill and
discard type; that is, once the buffers become
full, no new information is accepted and all
further data is discarded until space is made
when the datalogger requests data from the
SDM-SIO1A.
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