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COMPONENT LISTING
AT Series Communications PC Board (A12)
INDICATOR LIGHTS:
D1
Status LED
JUMPERS:
J20
Power Supply Connection
J21
Factory Connection
J22
RS-485 Terminating Resistor
(enable/disable)
CONNECTORS:
P13
Plug for Main Control PC Board (A1)
J13 Connection
SWITCHES:
S1
Configuration Switches
S2
MODBUS Address
TERMINAL BLOCKS:
TB10 RS-485 User Connection
TB11 RS-232 User Connection
Communications PC Board (A12)
3.2 Serial Connections
The communications option supports RS-232 and RS-485. RS-232 is a standard serial
communications used on personal computers.
acceptable to electrical noise. RS-485 serial communications allow longer distances and
allow multiple devices to be connected to the same serial network. TB10 terminal block is
for the RS-485 connections and TB11 terminal block is for the RS-232 connections.
3.2.1 RS-232
Set configuration switch S1-5 to OFF to select RS-
232. Configuration switch S1-6 Enables or Disables
the RTS and CTS handshaking lines. Terminal block
TB11 is for the RS-232 user connections. In each section for RS-232 3-wire and 5-wire
installation, a typical connection diagram is shown. Each diagram shows the pinout used for
a standard personal computer (PC) for either a 25-pin or 9-pin serial connection.
Figure 2
EN5004-00 AT Series
It has a limited cable distance and is
TB11 User Connection
Pin 1 Pin 2 Pin 3
RDX
TDX
COM
HARDWARE
Pin 4 Pin 5
RTS
CTS
5
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