GE Hydran M2-X Instruction Manual page 167

Hydran* M2-X Instruction Manual
Terminal
1 TDM common
2 TDM Out-
3 TDM Out+
4 TDM shield
5
RS-485 Out common
6 RS-485 Out-
7 RS-485 Out+
8
RS-485 Out shield
9 RS-485 In common a
10 RS-485 In-
11 RS-485 In+
12
RS-485 In shield
Table D - 1: Connections for the TDM and RS-485 Network Link Terminal Block
The RS-485 link is not electrically isolated. The Hydran M2-X's from a single network thus share the
a.
same ground reference (common).
b. The shield at this terminal is internally connected to ground through a spark gap and capacitor. The
other end of the cable must be connected to the In terminal of the next Hydran M2-X or to the Hydran
201Ci Controller.
c. This terminal is internally connected directly to ground.
d. The total length of all RS-485 link cables in a single network must not exceed 1,200 m (4,000 ft).
MA-029 Rev. 1.0, 30-Jul-18
Description
a
b
c
Direction (External)
To Hydran 201Ci
Controller
To RS-485 In
terminals of other
Hydran M2-X or to
Hydran 201Ci
Controller
From RS-485 Out
terminals of other
Hydran M2-X
Comments
For gas level
monitoring by
Hydran 201Ci
Controller; optional
TDM interface for
moisture
monitoring
32 Hydran M2-X's
can be daisy-
chained in a
network ; can also
d
be used with
Hydran 201R Model
i
Page 167