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Serial communication bus connection, Pressure and feedback wiring, Control terminal programming – Bell & Gossett 176R0649C Technologic 502 Series Pump Controller User Manual

Page 20: Serial communications programming

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20

Serial Communication Bus Connection

The bypass reports serial communication data to host

systems through the drive. Connection to the serial

communication network is made either through the

EIA-485 terminals on the controller (Figure 3-9) or, for

other protocols, terminals located on the communica-

tion option card. For option card connection, see the

option card instructions provided with the unit.

• For bypass serial communication protocols

using the EIA-485 terminals, make connections

in the following manner.

notE

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t

is

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braidEd

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sHiEldEd

,

twistEd

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cablEs

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noisE

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conductors

.

1. Connect signal wires to terminal (+) 68 and

terminal (-) 69 on control terminals of controller.

2. Terminate shield to grounded restraining clip

provided by stripping wire insulation at point of

contact.

3. If shielded cabling is used, do not connect end

of shield to terminal 61.

Pressure and Feedback Wiring

Connect differential pressure wiring and feedback

transmitter wiring to terminals as shown in Figure

3-9.

Control Terminal Programming

Control terminals must be programmed. Terminals

are multi-functional. Each terminal has a parameter

associated with it for setting the desired function. It is

essential for operation of the equipment that the con-

trol terminals are programmed correctly. Installation

programming for units is factory set. See program-

ming in this manual for more details.

See Figure 3-13 for the control terminals schematic

diagram.

Serial Communications Programming

Select the serial communication protocol type in Quick

Menu item Q8, Communications.

Press the OK key to access the parameter choices

and scroll to parameter 8-30, Protocol to select the

protocol in use.

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communication

instructions

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