Siemens Climatix Series - Page 122

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Siemens Standard application AHU CE1P3977en_02
Building Technologies Communication 01.02.2010
4 Controller ON:
 The module starts / initialization begins.
 As soon as the two LEDs "BSP" and "BUS" are steady green, com-
munication with the controller and Modbus bus is active.
Caution: HMI must be reset a second time to update; prior to parame-
terization.
5 Configure module.
Main Index > System overview > Communication > Comm module overview >
Module[x] Modbus
Main Index > System overview > Communication > Modbus > Module[x]
Modbus
Parameter Range Function
State − OK.
− Alarm
Module state.
Comm failure − Passive
− Active
Communication error between module and con-
troller.
Channel 0 / Channel 1. Displays as of this point the data for the first Modbus channel (channel 0, terminal T1)
and the second Modbus channel (channel 1, terminal T2) of the module.
These are the corresponding parameters, with the exception of enable:
Enable. − Passive
− Active
Modbus channel 1 only: Displays whether Mod-
bus channel 1 (terminal T2 on the module) is
enabled or not.
Caution: This parameter must always be set to
passive.
Slave − Active
− Passive
Displays whether the channel is used.
Slave address Current address for the Modbus connection on
the bus.
Baud rate − 2400
− 4800
− 9600
− 19200
− 38400
Displays transmission rate per the Modbus.
Stop bits
− One
− Two
Displays number of stop bits:
− One stop bit.
− Two stop bits.
Parity − None
− Even
− Odd
Displays parity.
Response timeout 0…3600 [sec] Settings access time for master.
The master must undertake read access within
this period, otherwise an alarm is triggered (this
function is not yet fully implemented).
Parameter Range Function
Termination
− Passive
− Active
A RS485 topology must always be ended using
wave resistors.
− Terminating resistor disabled.
− Terminating resistor enabled.
Settings channel 0 / 1 Go to parameter page for the first / second Mod-
bus channel.
General:
Parameter
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 122