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The SDM-SIO4A has a single address switch. This sets the address of the first
serial port of the module (port 1). Other ports have their own SDM address
which follow sequentially from the port 1 address. For example, if the address
switch is set to 4, port 1 has SDM address 4, port 2 has SDM address 5, port 3
has SDM address 6, and port 4 has SDM address 7. The equivalent ComPort
number of each port corresponds to the SDM address of the port in the same
way as for the SDM-SIO1A as shown in TABLE 6-1.
For the SDM-SIO4A, if the address switch is set to "C" (SDM 12) or above,
only the ports which would have valid SDM addresses are enabled. For
example, if the switch is set to "E" (14), only port 1 could be used as sequential
addresses above that are not valid.
1
Address F is not available as it is the broadcast address. Setting this address will result
in the SDM-SIO1A having an address of 0 rather than F.
6.2
Connection and Wiring
Connection to the SDM-SIO1A is achieved via the 11 terminals arranged along
the top of the unit. The terminals are spring loaded providing an easy and
reliable method of connection. Strip wires 7 to 9 mm and twist. Open the clamp
by pushing the orange tab down with the tip of a small flat-blade screwdriver
and insert the wire into the round hole. Release the clamp and verify the clamp
grips the wire rather than the plastic insulation.
SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules
TABLE 6-1. SDM Address Settings
Rotary Switch
Position
SDM Address
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
A
10
B
11
C
12
D
13
E
14
F
1
15
SerialOpen()
Instruction
COMPort
Number
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
1
47
1
9
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