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21
of
38
RS-232 Settings
9600 Baud
No Parity
8 Bits
1 Stop Bit
Full Duplex
Table 9
shows the pin configuration for all three serial communication options. The Terranova®
752A must receive input in less than or equal to 500 ms; otherwise, transmission will be voided.
For RS-232 serial communication, user will have to utilize either the Duniway cable
RS232-TN751A
or a user-supplied cable and a separate program, such as HyperTerminal, to
send query or command characters and read output. The control unit accepts single and
multiple input queries or commands via text file.
Pin
RS-232
RS-422/485
1
DCD
2
TxD
-Tx
3
RxD
-Rx
4
DTR
5
Common
Common
6
DSR
7
CTS
+Rx
8
RTS
+Tx
9
RI
Table 9.
SERIAL I/O 9-pin D-sub port pin configuration
Query Characters
The following input format is used by the Terranova® 752A to output unit parameters
*
[Hexadecimal Address][Query Character]
?
[
,
{Checksum Value}]
<cr>
where the asterisk symbol (
*
) indicates the start of transmission, the question mark symbol (
?
)
tags the transmission as a query string, and the return character (
<cr>
) ends input / output
transmission. The query character is a two-letter character used to select the unit parameter to
output
–
see
Table 10
for a list of query characters. Query characters are not case-sensitive.
The hexadecimal address is a two-digit hexadecimal value from 00 to FF (or 0 to 255 in decimal
notation) used to differentiate between multiple devices. The hexadecimal address is only
necessary when the unit is configured for RS-485 serial communication
–
see
Changing the
RS-485 Address
.
