Omron CPM2C Operation Manual page 98

Unit Components
RS-422 Setting RS-485 Setting
SW1 SW1
SW3
All pins are turned
OFF at the factory.
SW4
Resistance
connected
4. RS-422/RS-485 Switch (SW1)
Switches the RS-485 interface and sets RS/CS controls for the RS-485 in-
terface.
Pin on SW1
1
2
3
4
Note The default setting is for 2-wire RS-485 communications. Do not turn ON both
SW1-3 and SW1-4 at the same time. Doing so will destroy internal circuits.
5. Communications Switch (SW3)
Pin
1 Baud rate with CPU Unit
2 Baud rate with components
3 Data length with components
4 Parity 1 setting with components
5 Parity 2 setting with components
6 Stop bits with components
7 Not used. (Always leave pin 7 OFF.)
8 Component communications speed
Note a) Pins 3 to 6 on SW3 are used to set communications between gen-
eral-purpose communications components and the Simple Com-
munications Unit.
b) Turn OFF pin 7 on SW3. Operation may not be correct if this pin is
turned ON.
Terminating Resistance
RS-422: 235 Ω (combined
resistance must be 110 Ω min)
Resistance RS-485: 118 Ω (combined
resistance must be 54 Ω min)
not connected
RS-422 RS-485
OFF ON
OFF ON
ON OFF
OFF ON
Setting
Normal
High-speed
Section 2-2
OFF ON
9,600 bps 19,200 bps
9,600 bps 19,200 bps
38,400 bps 57,600 bps
7 bits 8 bits
Yes None
Even Odd
2 1
Leave OFF. ---
Normal High-speed
75