Altronic CDM-2100 Manuale operativo - Pagina 11

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9.8 RX, TX INDICATORS:

RX and TX (receive and transmit) LEDs on the back of the gauge indicate when

the unit is receiving or transmitting data.

9.9 CONNECTING TO A PC:

When connecting the gauge to the RS-232 port on a PC, an RS-232 to RS-485

converter must be used for the communication interface.

9.10 LOADING:

RS-485 uses a balanced differential pair of wires switching from 0 to 5 volts to

communicate data. In situations where many units (32 max.) are connected

together on a long run, voltage drop on the communications leads becomes a

major problem. Voltage drops on the RS-485 minus lead appear as a common

mode voltage to the receivers. While the receivers are rated to a maximum

voltage difference of ±7 volts, -7 V to +12 V, a practical system should not have a

voltage difference exceeding ±3 volts under normal conditions. The wire gauge

used for the connections, therefore, limits the maximum number of units or

the maximum length of wire between units in each application. The following

formula can be used as a guideline to select the appropriate wire gauge.

For 18 AWG wire



For 20 AWG wire



For 22 AWG wire



10.0 MODBUS REGISTER LISTS

The maximum number of registers that can be read at one time is limited to 32.

The maximum number of booleans that can be read at one time is limited to 256.

All communications are at 9600 baud (default), see section 9.3 for other speeds

8 Data bits, No Parity, 1 Stop bit (9600 8N1).

10.1 00000 SERIES REGISTERS

ADDRESS

DESCRIPTION OF FUNCTION

00001

PROTECT CONFIGURATION

Protect configuration from being changed by keypad

00002

PROTECT SETPOINT

Protect setpoints from being changed by keypad

00003

PROTECT COMMUNICATIONS

Protect against ModBus writes

00004

PROTECT CALIBRATION

Protect against changing calibration values

00005

DISPLAY LOOP

Display loop value on home screen

00006

RESET MIN/MAx

Reset MIN/MAx readings

00008



RESERVED

00016

00017

SWITCH 1 RESET

00018

SWITCH 1 STATE

00019

SWITCH 1 TYPE

00020



RESERVED

00024

00025

SWITCH 2 RESET

00026

SWITCH 2 STATE

00027

SWITCH 2 TYPE

CDM-2100 OM 3-21

No. of units = (4000)/(ft. of wire used)

No. of units = (2500)/(ft. of wire used)

No. of units = (1600)/(ft. of wire used)

0=OFF 1=ON

0=OFF

0=SHELF

0=NON-LATCH

0=SHELF

0=NON-LATCH

NOTE: The maximum number of units

connected in a system is 32.

NOTE: All temperatures are stated

in 0.1 DEG. Kelvin (for universal

compatibility). Therefore a register

value of 2730 is 273.0° K, which is 0°

C, or 32° F.

1=ON

1=RESET

1=FAILSAFE

1=LATCHING

1=RESET

1=FAILSAFE

1=LATCHING