CS SR50A, Instruction Manual

Page: 60 / 84

Appendix D. RS-232 and RS-485 Operation
D-4
D.3 RS-485 Wiring to a CR6 Datalogger
The SR50A is a half-duplex device and can only be used on the COM1 ( C1
and C2 ) terminal blocks.
TABLE D-4. Connections for CR6 RS-485 Mode
Color Function Connection
Black Power Ground G
Red Power
12V
Green RS-485 A C1
White RS-485 B C2
Clear Shield
G
D.4 RS-232 and RS-485 Settings
Once the jumpers are set for RS-232 operation, a terminal program such as
Device Configuration Utility or Tera Term can be used to change factory
defaults or existing settings. Use a terminal program that allows local echo.
The SR50A does not echo key presses. To see what is being typed, Local Echo
must be switched on. A quick introduction to Tera Term is located in Appendix
E , Tera Term QuickStart
(p. E-1)
. The following settings apply to Device
Configuration Utility or any program used for communications.
Baud Rate: Current SR50A Setting Note
Data Bits:
8
Parity: None
Stop Bits: 1
Flow Control: None
Local Echo:
On
The factory default baud rate is 9600 bps. Once the baud rate is
changed, the new baud rate must be used for further
communications to the SR50A. Ensure to keep track of the baud
rate setting on the SR50A. If the baud rate setting is unknown, try
using the default value of 9600 bps. If that does not work, start the
baud rate at 1200 bps and go through all the baud rate settings until
the correct one is found.
Select the following when using Device Configuration Utility (FIGURE D-3 ).
•
Device Type: Unknown
•
Choose the correct COM port.
• By default, the baud rate in the SR50A and Device Configuration
Utility is set to 9,600. Only change the baud rate if you know it has
been changed in the SR50A.
•
Click on the Connect button in the lower left hand corner.
NOTE