SDM-SIO1 Serial Input/Output Module
6
Table 3-1. SDM address settings
Rotary switch
position
SDM address
SerialOpen
command comm.
port number
0
0
32
1
1
33
2
2
34
3
3
35
4
4
36
5
5
37
6
6
38
7
7
39
8
8
40
9
9
41
A
10
42
B
11
43
C
12
44
D
13
45
E
14
46
F
(1)
15
(1)
47
(1)
(1)
Address ‘F’ is not available as it’s the broadcast address. Setting this address will result
in the SDM-SIO1 having an address of ‘0’ not ‘F’.
3.1 Connections
Connection to the SDM-SIO1 is achieved via the 15 terminals arranged along the
top of the unit. The terminals are spring loaded providing an easy and reliable
method of connection. Wires should be stripped 7-9 mm, twisted and inserted in
the round hole whilst opening the clamp by pushing a screwdriver in the adjacent
rectangular hole or by pushing a screwdriver into the hole on the side of the
connector. Remove the screwdriver to close the clamp making sure the clamp
grips the wire rather than the plastic insulation.
If there is a need to insert more than one wire in each terminal, if using multi-
strand wire twist the conductors together first. If using solid wires, either solder
or crimp multiple pairs together before insertion. For RS-485 connections note
that the RS-232 terminals double up as a secondary connection, so it is rare to have
multiple conductors in one terminal as both sets of connections can be used either
for forming an RS-485 daisy-chain or for adding termination resistors at each end
of a network.
When making connections to the datalogger always ensure power to the datalogger
is switched off and connect the ground (G) connection first.
Below is a table showing all the connections on the SDM-SIO1. There are a
number of pins that are common within the unit, these are also shown below.
