Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 5)

1. INTRODUCTION
This guide is intended to facilitate digital communication between your computer (or other controlling device)
and one or more meters.
This digital-communications guide is provided for use with any of the meters OWNER’S GUIDES for Process,
Strain gauge, Temperature, Universal, Rate meter/totalizer, Batch controller or Clock, which provide details of all
applicable inputs, connections, option, push button controls and programming procedures.
2. HARDWARE
2.1 Definition of Terms
RX: Received line on RS-232
TX: Transmit line on RS-232
RTS: Request to send
ARX: First pair received line on RS-422/485 = +RX
ATX: First pair transmit line on RS-422/485 = +TX
BRX: Second pair received line on RS-422/485 = -RX
BTX: Second pair transmit line on RS-422/485 = -TX
Gnd: Ground
2.2 RS-232 Hardware
INSTALLATION: The RS-232 card in approximately 1” high and 5” long, refer to Figure 2-1A. If you have an
older option card refer to Figure 2-1B.
It is installed with the meter removed from its case (Refer to Section 5 of your meter’s Owner’s Guide for
instructions on how to open the meter).
P11 inserts into J11 of the main board located next to the transformer (Refer to Figure 2-2). You should install
the option board in such a way the pin “1A” of “P11” is aligned with pin “1A” of “J11”.
The board is held in position by a plastic guide on the rear of the display board and plastic assembly at the rear
of the meter.
The 6-pin telephone jack, P4, is available at the rear of the meter case, and accepts a type RJ-11 or RJ-12
telephone plug (Refer to Figure 2-3).
Logic signals are opto-isolated, and drive power is obtained from a galvanically-isolated transformer winding so
that the ±7 V signal levels from the meter can be slaved to the external controller (computer) ground; earthing
that ground is recommended.
Refer to Figure 2-1A. When interfacing the meter to devices that do not have handshaking lines, i.e. RTS/CTS,
the S3-E Jumper should be installed. However, when interfacing to a PC, the S3-E should be removed.
CF 125 INFINITY SC GUIDE 1 M1519/N/0605