Aerco Modulex E8 Controls Guide Manual de usuario descargar pdf (Pagina 93)

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GF-115-C

OMM-0084_0D

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526- 0288

9. BCM MODBUS AND ADDRESS ASSIGNMENTS

9.1 BCM Modbus Communication & Support Requirements

The Modbus communication support requirements incorporated in the BCM are as follows:

9.1.1 Function Codes

The BCM supports the Modbus Function Codes SHOWN IN Table 9-1.

Table 9-1: Supported Modbus Function Codes

FUNCTION CODE DESCRIPTION

03 Read up to 8 contiguous Holding Registers

04 Read up to 8 contiguous Address Registers

06 Write a single 16 bit Register

9.1.2 Modbus Support Requirements

The Modbus Network must conform to the support requirements listed in Table 9-2.

Table 9-2: Modbus Support Requirements

CHARACTERISTIC DESCRIPTION

Communication Medium

BMS II/ACS or EMS Master to

BCM Slave

RS485 2-Wire Differential Bus With Shield

RS485 Allowable Cable Length 4000 Feet Maximum

Address Support From Master

EMS

1 to 9 via Address Select Switch (SW1).

(Addresses from 10 to 127 can be implemented via

software)

Transmission Mode Support RTU (Remote Terminal Unit)

Timing Specifications:

Baud Rate:

Data Framing:

Message Framing:

Character Framing:

Heartbeat Timeout:

Fixed at 9600

8 data bits, no parity, 1 stop bit

Silent period of at least 3.5 character times Before

first character and After last character

No more than 1.5 character times of silence

between received and transmitted characters.

Adjustable (0 or 1 – 240 seconds)

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 111 112

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Aerco Modulex E8 Controls Guide Manual de usuario Pagina 93