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COM Port Associations - E2 Versions 4.2 and Above ECT MODBUS Networking to E2s • 23

19.2.COM Port Associations

- E2 Versions 4.2 and

Above

An E2 has three COM ports that can be assigned

for MODBUS communication (COM2). COM ports

can only be used for one function; in other words, if

COM2 is set up as the I/O network, you cannot con-

nect MODBUS devices to COM2. Ensure your E2 is

configured in E2 General Services (

,

Serial tab)

to enable COM4 or COM6.

19.3.E2 Setup of Devices

19.3.1.Set Up Network Ports

Before setting up device, the port on the E2 that

has the MODBUS cable connected must be set up as

a MODBUS port.

1. Log in to the E2 with Level 4 access.

2. Press  followed by  - General

Controller Info.

3. Press + to open the Serial tab of the General

Controller Info setup screens:

4. This screen will have a “Connection” field for all

COM ports on the E2. Highlight the COM port con-

nection field that will be used for the device, and

press  - LOOK UP. From the list of network

types, select MODBUS.

5. Four fields will become visible underneath the

COM port connection field, which pertain to the

way the device communicates:

• Baud - Default setting is 19.2k. The baud rate

setting should be set to match the baud rate of

the device (9600). (All devices connected to the

same COM port should be set to the same baud

rate.)

• Data Size - Leave this field at the default value

(8).

• Parity - Leave this field at the default value

(None).

• Stop Bits - Leave this field at the default value

(1).

6. Press  to save changes and exit.

19.3.2.Add and Connect the Device

To enable communications between E2 and the

units, the devices must be added and addressed in E2.

1. Log in to the E2 with Level 4 access.

2. Press  - Connected I/O Boards

Figure 19-3 - Location of E2 COM Ports - E2 PIB Board (E2

version 4.2 and above)

Figure 19-4 - Serial Communications Manager Screen

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