Specifications

SDM-SIO1 Serial Input/Output Module

There can be up to 15 SDM-SIO1s on a single SDM bus. Each SDM-SIO1 will

need to have a unique address before they are powered up. If other equipment

is present on the bus, whether it’s an SDM-SIO1 or not, the user needs to

insure no addresses are the same.

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

(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 .25” (7mm), twisted

and inserted in the round hole while 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 a terminal when using

multistrand wire, twist the conductors together first. If using solid wires, either

solder or crimp wires 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.