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Communications Section 7
YSI Incorporated Environmental Monitoring Systems Operations Manual 7-
1
SECTION 7 COMMUNICATION
This section describes the communication protocols that the Sondes use to communicate with the host
system.
Section 7.1 gives a brief overview of the communication ability of the Sondes. The remaining
sections describe available hardware and software features.
7.1 OVERVIEW
The
s
ondes communicate via a serial port that can be configured as either a SDI-12, or a 3-wire
RS-232 interface. The normal mode of operation for the sonde is RS-232, with the following
configurations:
Baud rate: 300, 600, 1200, 2400, 4800, 9600
Data Bit: 8
Parity: None
Handshake: None
For further detail into the sondes RS-232 and SDI-12 implementations, see
S
ections 7.3 and 7.4
respectively.
With these configurations, the Sonde is capable of interfacing to a variety of devices from a
“dumb” terminal to numerous data collection platforms.
7.2 HARDWARE INTERFACE
Connection from the Sonde to the host computer is provided using the YSI 6095B MS-8 to DB-9 female
adapter. This 6095B then connects to the standard DB-9 male connector on the host computer. The Sonde
PC interface cable is wired for direct connection to a DTE device. The following table defines the interface
circuits. The signals and their directions are defined with respect to use of the Sonde with the 6095B
adapter.
Wire
Color
Pin
Description DB-9 MS-4 MS-8
Yellow RS232 TX 2 ---- C
Orange RS232 RX 3 ---- D
Green Alarm ---- ---- E
Grey RTS ---- ---- G
Blue CTS ---- ---- H
Red + 12V DC 9 A A
Black GND 5 C B
Purple SDI-12 ---- B F
Bare Shield ---- ---- B