How to split one modbus serial output port into two?

Hi all,
Current Situation
My company has a instrument measuring emission in flue gas. The instrument has only one serial port for "modbus" output. The serial port is being used to sending the data collected by the instrument to our DCS.
My Question
I have a separate data acquisition computer which is also able to collect data over serial modbus. Is it possible to split the existing serial modbus output port into two so that both the DCS and my data acqusition computer can collect data from the instrument at the same time? If yes, what software and hardware do I need? One more point, high reliability is required for both data collection processes - to the DCS and to the data acquisition computer.
Thanks and regards,
Roger

What serial protocol are you using? RS-232 or RS-485?
If it is 485, then it is a multidrop bus, so you can just hook up both receivers to the transmitter via a RS-485 hub. If it uses the 232 protocol, then this would not work as only one device can receive data at any given time, so you could set one node up to repeat the signal to the second hub or use LabVIEW Shared Variables.
A Quick Comparison of RS-232, RS-422, and RS-485 Serial Communication Interfaces
Regards,
Peter Flores
Applications Engineer

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Step 1
Row_Num | Col1 | Col2
1 52 100
1 52 101
1 52 102
1 52 103
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2 52 203
2 52 204
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SQL >with t1 as (
2              select 1 row_num,52 col1,100 col2 from dual union all
3              select 1,52,101 from dual union all
4              select 1,52,103 from dual union all
5              select 2,52,200 from dual union all
6              select 2,52,201 from dual union all
7              select 2,52,202 from dual union all
8              select 2,52,203 from dual union all
9              select 2,52,204 from dual union all
10              select 2,52,205 from dual
11             ),
12       t2 as (
13              select row_number() over(partition by row_num order by col2)
14                      dense_rank() over(order by row_num) rnk,
15                      col1,
16                      col2
17                from t1
18             )
19 select distinct case rnk
20                     when 1 then col1
21                     else lag(col1) over(partition by rn order by rnk)
22                   end col1_a,
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24                     when 1 then col2
25                     else lag(col2) over(partition by rn order by rnk)
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31                   case rnk
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33                     else lead(col2) over(partition by rn order by rnk)
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36    order by col2_a nulls last,
37             col2_b nulls last
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        52        100         52        200
        52        101         52        201
        52        103         52        202
                              52        203
                              52        204
                              52        205
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with t1 as (
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            select 1,52,101 from dual union all
            select 1,52,103 from dual union all
            select 2,52,200 from dual union all
            select 2,52,201 from dual union all
            select 2,52,202 from dual union all
            select 2,52,203 from dual union all
            select 2,52,204 from dual union all
            select 2,52,205 from dual
got_rs AS
SELECT row_num
, col1
, col2
, ROW_NUMBER () OVER ( PARTITION BY row_num
               ORDER BY      col2
       ) AS r_col2
FROM t1
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,   MIN (DECODE (row_num, 1, col2)) AS col1_2
,   MIN (DECODE (row_num, 2, col1)) AS col2_1
,   MIN (DECODE (row_num, 2, col2)) AS col2_2
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GROUP BY r_col2
ORDER BY r_col2
OL1_1     COL1_2     COL2_1     COL2_2
   52        100         52        200
   52        101         52        201
   52        103         52        202
                         52        203
                         52        204
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My query assumes (and is a strong assumption) that two rows of the source table can be associated only if they have the same last two digits of the col2 column.
SVIL>with t0 as (
2              select 1 row_num,52 col1,100 col2 from dual union all
3              select 1,52,101 from dual union all
4              select 1,52,103 from dual union all
5              select 2,52,200 from dual union all
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7              select 2,52,202 from dual union all
8              select 2,52,203 from dual union all
9              select 2,52,204 from dual union all
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