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1.7
SERIAL MODBUS INTERFACE
The 8099's asynchronous serial Modbus interface provides RS-232 single-ended
and RS-485 (RS-422) differential signals with available internal termination
network. Signals are selected by internal jumpers. The 8099 has a DB-25S
connector on its rear panel. Signal pinouts conform to EIA RS-530 specifica-
tion and are listed in Table 2-2.
1.7.1 Modbus RTU Message Format
Messages conform to the Modbus RTU format and include the device address,
command, register number, data and CRC formatted as binary bytes. Supported
Modbus commands are: 01, 02, 03, 04, 05, 06, 07, 08, and 16 for integer values
and commands 03 and 16 for floating point 32-bit values.
Integer range 16 bits or 65,536
Floating point IEEE-754
1.7.2 Baud Rates
Parser selects closest rate to specified rate when a nonstandard rate entered.
Standard rates are: 50, 110, 300, 600, 1200, 2400, 4800, 7200, 9600, 14400,
19200, 28800, 38400, 57600, 76800, and 115200 baud.
1.7.3 Data Character Formats:
Data bits
7 or 8 data bits per character
Parity
none, even or odd
Stop bits
1 or 2 stop bits per character
1.7.4 RS-232 Specifications
All units have single-ended RS-232C drivers and receivers that are designed
to operate with up to 50 feet of cable. Hardware handshaking is supported
but not required.
Transmit +9 Vdc = Logic "0" or On
Levels
-9 Vdc = Logic "1" or Off
Receive
±1.5 Vdc minimum, ±25 Vdc Maximum
Signals
AA, AB, BA, BB, CA, CB, CD and CF
Содержание 8099
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