Intek 200 - Manual (Page 13)

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2.4 SERIAL OUTPUT
The Model 200 has RS232/422 output receptacles used during factory calibration. There is a data stream
that can be accessed with a specially wired six-position RJ-11 jack (modular telephone jack) and
computer connection. See Table 1 and Figure 4 for wiring information.
If a distance of greater than twenty-five feet is needed for the serial communications, RS-422 should be
used instead of RS-232. Inspect the jumper at JP14 (Figure 2) for the proper communication type.
TABLE I. RJ-11 to DB-9 Module Adapter
RS-232 CONFIGURATION RS-422 CONFIGURATION
RJ-11 Pin Out DB-9 Pin Out RJ-11 Pin Out DB-9 Pin Out
1 Tx (transmit) 1 N/C 1 Tx+ (transmit+) 1 Rx ! (receive ! )
2 N/C 2 Tx (transmit) 2 Tx ! (transmit ! ) 2 Rx+ (receive+)
3 Rx (receive) 3 Rx (receive) 3 Rx+ (receive+) 3 Tx+ (transmit+)
4 N/C 4 N/C 4 Rx ! (receive ! ) 4 N/C
5 Power (+5V) 5 Ground 5 Power (+5V) 5 Ground
6 Ground 6 Pulled high 6 Ground 6 Tx ! (transmit ! )
7 N/C 7 TBD
8 Pulled high 8 TBD
9 N/C 9 TBD
Custom software may be developed by the user to receive and archive Model 200 data into a computer
system. The electronics has a serial data protocol of 9600 baud, no parity check, eight data bits and one
stop bit (i.e., 9600,N,8,1). Each transmitted group of data is sent in a standard ASCII coded format
representing each process variable value, instrument identification and status information.
The data stream consists of six fields, followed by a carriage return <RETURN>. The first three fields
are the process values. Following the process variables are the Model 200 serial number (ten bytes), the
process identification tag number (ten bytes), and the system status (seven bytes). The data stream is
then ended by a single <RETURN> byte (ASCII code 13). The total number of bytes transmitted in each
data stream is 50 bytes including the trailing <RETURN>. This data group is sent about once every
second. The field names and number of bytes in one data stream are shown below.
Flow Rate
(% )
Totalizer
(Field Units)
Temp.
(°F)
Instrument
S/N ID Tag No. Status Term. (CR)
6 Bytes 10 Bytes 6 Bytes 10 10 7 1
The first and third process variables, % of full scale flow rate and temperature, are sent in the fixed
decimal format of xxx.xx with leading and trailing zeros inserted to maintain the six byte character
length. The second process variable sent is total flow, with a ten byte character length and leading and
trailing zeros, as well as a fixed decimal point (if used), inserted. The next three fields are ASCII text
strings followed by the <RETURN>. Example: The six bytes for a temperature of 75.5°F would be
075.50, or 48,55,53,46,53,48 ASCII.