Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
1106 System Manual, V4.2, 09/2016, A5E02486680-AK
3964R or Freeport. Select 3964R to configure port for 3964(R) communication
Operating mode* Full duplex (RS422) four-wire operation point-to-point. (Enabled)
Receive line initial state* Enable one of the following choices:
• None
• Bias with R(A)>R(B)>=0V
• Bias with R(B)>R(A)>=0V
Wire break* Enable one of the following choices:
• No wire-break check
• Enable wire-break check
Baud rate The default value for the baud rate is 9.6 Kbits per second. Valid choices are: 300 baud,
600 baud, 1.2 Kbits, 2.4 Kbits, 4.8 Kbits, 9.6 Kbits, 19.2 Kbits, 38.4 Kbits, 57.6 Kbits, 76.8
Parity The default value for
parity is no parity. Valid choices are: No parity, even, odd, mark (parity
bit always set to 1), space (parity bit always set to 0), and any parity (set parity bit to 0 for
transmission; ignore parity error when receiving).
The number of data bits in a character. Valid choices are 7 or 8.
The number of stop bits can be either one or two. The default is one.
* CM 1241 (RS422/485) module only
Configuring the 3964(R) priority and protocol parameters
You can use either of the following methods to configure the communication interfaces for
3964(R) communication:
● In the device configuration of the communication interface, click "3964(R) configuration"
to set the priority and configure the protocol parameters. The CPU stores the device
configuration settings and applies the settings after a power cycle.
● Use the P3964_Config (Page 1120) instruction to set the priority and protocol
configuration parameters. The values set by the instructions are valid while the CPU is in
RUN mode. The values revert to the device configuration settings after a power cycle.
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