7-1
EAR99 Technology Subject to Restrictions Contained on the Cover Page
SyriXus Series Pumps Installation and Operation Guide
Section 7 Modbus Configuration
7.1 Overview
Modbus is a simple command/response mechanism to ‘read from’ and
‘write to’ specific memory locations called ‘registers’. A register is a
holding place for a piece of digital information within the equipment.
For more information on Modbus, please refer to the following docu-
ments which can be found on the
www.modbus.org
website:
Application Protocol Vol. 1 and Modbus Over Serial Line Vol. 1
and
The SyriXus series syringe pump controller supports the Modbus RTU
and Modbus TCP/IP protocols.
7.1.1 Modbus RTU
The Modbus RTU protocol implementation uses a 2-wire RS-485 con-
nection. The RS-485 connections are located on the DB25 connector
labeled RS-232/RS-485. Teledyne ISCO recommends connecting the
ground reference wire as shown in Figure 7-1. The matching con-
nection is a D-Subminiature 25-pin standard plug, such as a TE Con-
nectivity AMP connector (P/N 747912-2) from an electronic parts
supplier.
WARNING
Connecting devices to energized circuits may cause personal
injury or property damage. Power must be removed from the
pump before connecting external devices.
Figure 7-1
RS-485 Connection
