Specifications

Open CTM (Revision D)

Command Reference

Note4: All MODBUS serial slave devices connected to a serial bus configuration such as RS485 must use

the same transmission mode. (This configuration is in accordance with the MODBUS specification)

modbusadd id n p d s m w

Adds a MODBUS Serial Slave (Previously in firmware version R1.2.0 and below)

id = 1 to 247 MODBUS ID

n = 1200 1200 Baud

n = 2400 2400 Baud

n = 4800 4800 Baud

n = 9600 9600 Baud

n = 19200 19200 Baud

n = 38400 38400 Baud

n = 57600 57600 Baud

n = 115200 115200 Baud

p = n or N no parity

p = e or E even parity

p = o or O odd parity

d = 7 or 8 data bits

s = 1 or 2 stop bits

m = a or A ASCII transmission mode

m = r or R RTU transmission mode

w = f or F flow control, leave empty for no flow control

Note1: For MODBUS RTU configuration to function properly d = 8 must be entered. (This configuration is

in accordance with the MODBUS specification)

Note2: modbusadd will return ERROR if modbusadd is configured with parameters missing or incorrect

parameters. Ensure that the modbusadd parameters match those from the above list.

Note3: If the baud rate of the serial port is changed from the serial console using the modbusadd

command, and the baud rate of the host application is changed to match the new configuration after

implementing this command, then the serial console should still be able to accept commands. This

functionality is only available if the connection mode of the modem is mode = 1 or mode = 2 before

issuing modbusadd. After changing the serial port configuration, a cmd save and a power cycle is highly

recommended.

modbusadd backward compatibility

Starting in firmware version R1.2.1, the newer form modbusadd id Serial m used with the port command

is the preferred way for adding new serial slaves.

Starting in firmware version R1.2.1, the form modbusadd id n p d s m w is provided for backward

compatibility only. This form uses the n p d s w parameters with port to set the serial port settings and

the id m parameters with modbusadd id Serial m. The form modbusadd id n p d s m w is only used for

setting and will not be queried back in the same form. The changes that come into effect by using this

form can be queried by using the modbusadd and the port commands; using modbusadd without

parameters will always display commands in the form modbusadd id Serial m.