Knowledge Base

MS120: Connections and adjustments

The above picture shows all the connectors used for making external connections to the MS120, plus various adjustment points. These are:

Bidirectional digital I/O 0-3 and 4-7

There are two 6-pin connectors for 8 I/O points which can each be used as an input or an output. Each connector has 4 signal pins as well as connection to the positive supply voltage and to common (ground). The wiring for these is detailed separately for input mode and output mode.

Inputs 8 to 11

This is a single 6-pin connector for 4 input-only pins. These can be configured as a group to act as NPN or PNP inputs. The connector also has positive supply and common connections.

Power

This 5-pin connector is for applying power to the MS120. This is a special arrangement that allows for two separate power supplies so you can implement a variety of backup and/or battery standby schemes. The wiring and power supply schemes are described under MS120 Power supply.

Pwr link

The 2-position jumper helps determine the power supply scheme. This is detailed under MS120: Power supply

Comms

This is the connector you connect to for programming the MS120. This is NOT an RS232 connector. A PC232 programming cable adaptor is required for connecting to a PC for programming.

SPx

The SPx expansion scheme is documented elsewhere in the SPLat Knowledge Base. This connector is for expansion boards like the XBIO16.

SPice

This connector is for low cost SPice add-on boards. It is virtually identical to the SPice connector on MMi99, MMi200 and SL99 controllers. TSP is not supported. Normally you would simply plug a compatible board onto this connector. Some information about the connector is provided under MS120 SPice connectors.

SPice2

This is a second Spice connector, providing more SPice expansion pins in the MS120 than in previous models.

NPN/PNP link

This 2-position jumper determines whether inputs 8-11 operate in NPN or PNP mode. This is detailed under MS120: Dedicated NPN/PNP inputs.

Contrast

This is for adjusting the contrast on the optional liquid crystal display. It is factory preset and should normally not need adjusting.