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M4RTU/M4 I/O User’s Guide
INSTALLATION AND SETUP
CONNECTING TO A HOST PC OR MODEM
The M4RTU/M4 I/O features two built-in serial ports, COM0 (RS-232) and COM1 (RS-485), with a data transfer
rate of 300 Bd to 115.2 Kbps. Two additional serial ports are available by installing an optional M4SSER serial
expansion card into one of the M4RTU/M4 I/O expansion card slots. (See Chapter 4 for complete information.)
Wiring
Important:
Serial port connectors wired for other Opto 22 controllers may not be compatible with the M4RTU/
M4 I/O. Use the M4RTU/M4 I/O connectors provided and refer to the diagrams in this manual
for wiring information.
The following sections describe wiring for the serial ports found on the M4RTU/M4 I/O base unit. Use Tables
3-3 and 3-4 as a reference for wiring the pluggable, 7-terminal serial port connectors, shown in Figure 3-16.
RS-232 COM0 Pin Connections
The M4RTU/M4 I/O has one built-in RS-232 COM0 serial port. Table 3-4 contains descriptions for each
COM0 pin.
Important:
If RTS and CTS are not used, RTS must be connected to CTS (COM0 only) on the M4RTU/
M4 I/O.
Figure 3-16: 7-Terminal Serial Port Connectors
Summary of Contents for Modular M4RTU
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Page 82: ...82 M4RTU M4 I O User s Guide ADDRESS JUMPER CONFIGURATION...
Page 86: ...86 M4RTU M4 I O User s Guide UPGRADING RAM AND FLASH EEPROM...
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Page 91: ...M4RTU M4 I O User s Guide 91 WORKSHEETS Figure F 5 Field Wiring Worksheet Example 2...
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