7-1
D Series Syringe Pumps
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 documents which can be found on the
www.modbus.org website: Modbus Application Protocol Vol. 1
and Modbus Over Serial Line Vol. 1
2
and Modbus Messaging on
TCP/IP.
The Isco D 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 connection. The RS-485 connections are located on the
DB25 connector labeled RS-232/RS-485. We recommend
connecting the ground reference wire as shown in Figure 7-1.
The matching connection is a D-Subminiature 25-pin standard
plug, such as an AMP part #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
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