PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 3
GFK-2222AK October 2019
CPU Configuration 64
(RTU Slave only) ID for the RTU Slave.
Valid range: 1 through 247.
Default: 1.
Note: You should avoid using station address 1 for any other Modbus slave in a
PACSystems control system because the default station address for the CPU is 1. The
CPU uses the default address in two situations:
1. If you power up without a configuration, the default station address of 1 is used.
2. When the Port Mode parameter is set to Message Mode, and Modbus becomes
the protocol in STOP Mode, the station address defaults to 1.
In either of these situations, if you have a slave configured with a station address of
1, confusion may result when the CPU responds to requests intended for that slave.
Note: The least significant bit of the first byte must be 0. For example, in a station address
of 090019010001, 9 is the first byte.
(All Port Modes, except Available.) Data rate (bits per second) for the port.
Choices: 1200 Baud, 2400 Baud, 4800 Baud, 9600 Baud, 19.2k Baud, 38.4k Baud, 57.6k
Baud, 115.2k Baud.
Default: 19.2k Baud.
(Available only when Port Mode is set to Message mode or Serial I/O.) The number of bits in
a word for serial communication. SNP uses 8-bit words.
Choices: 7, 8.
Default: 8.
(RTU slave, Message Mode, or Serial I/O.) Type of flow control to be used on the port.
Choices:
▪ For Serial I/O Port Mode: None, Hardware, Software (XON/XOFF).
▪ For all other Port Modes: None, Hardware.
Default: None.
Note: The Hardware flow-control is RTS/CTS crossed.
(All Port Modes, except Available.) The parity used in serial communication. Can be changed
if required for communication over modems or with a different SNP master device.
Choices: None, Odd, Even.
Default: Odd.
(Available only when Port Mode is set to Message Mode, SNP Slave or Serial I/O.) The number
of stop bits for serial communication. SNP uses 1 stop bit.
Choices: 1, 2.
Default: 1.
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