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850 - Serial Protocol

8 Serial Protocol

The 850 can be controlled via the serial port using the commands described in this

section.

8.1 Command Format

Commands must be in the following format:

0xEB, address, command, length of data, data 1,…, data n, checksum

where the following table describes the command components.

Command

Component

Description

0xEB

Fixed command start byte

address

Device address. This is always 0x90 for the 850

command

Command to be sent (see Section 8.3)

length of data

How many bytes sent/received (from data 1 to data n)

data 1, data n

One or more command variables within the range 0x01 to 0xFA and excluding 0xEB

checksum

Optional—Checks whether the sending/receiving frame is valid.

Check sum = Address + Command + Data length + Data 1+…+Data n

For example, EBH, 90H, 01H, 01H, F3H, 85H

Check sum = 90H + 01H + 01H + F3H = 185H

Note: The checksum gets the low 8 bits, for example, if the check sum = EBH, then check sum =

14H

8.2 Device Response

The device responds as follows:

0xEB, 0x90, command, 0x01, answer, check sum

where answer is one of the values described in the following table.

Command

Component

Description

0xF1

Either:

–the device received the wrong address and returns no response

–the device gets information about Errors and Alarms

0xF2

The data is out of range. The command is not executed

0xF3

The device is currently controlled by the buttons. The command is not executed

0xF7

The data length is incorrect. The command is not executed

0xFC

The data is out of range. The command is not executed

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