User`s manual

84 www.rabbit.com EM1500 Specifications

A.4.2 How to Move the Jumpers

Zero ohm surface-mount resistors are used for JP1; this requires soldering to change position. Standard

pluggable jumpers are used for the remaining headers.

The table below lists the configuration options.

Table A.2 EM1500 Jumper Configurations

Header Description

Pins

Connected

Factory

Default

JP1

Digital inputs pulled up 1–2

Digital inputs pulled down 2–3

JP2

RS-232 levels for SER3 (Rx, Tx)

1–3

2–4

TTL levels for SER3 (Rx, Tx)

3–5

4–6

JP3

RS-232 levels for CTS/RTS lines of SER3

1–3

2–4

TTL levels for CTS/RTS lines of SER3

3–5

4–6

JP4

1. Not fitted on revision C boards.

RCM3200 installed 1–3

Reserved for future use 3–5

JP5 RS-485 bias and termination resistors

connected

1–2

5–6

RS-485 bias and termination resistors not

connected.

1–3

4–6