M4RTU/M4 I/O User’s Guide
49
INSTALLATION AND SETUP
PIN CONNECTIONS/DESCRIPTIONS
Table 3-4: Pin Descriptions for the M4RTU/M4 I/O COM0 Serial Port
Pin
COM0
1
Data Carrier Detect (DCD)
2
Transmit (TX)
3
Receive (RX)
4
Request-to-Send (RTS)
5
Clear-to-Send (CTS)
6
Data Terminal Ready (DTR)
7
Ground (GND)
RS-485 COM1 Pin Connections
An RS-485 COM1 port is also built into the M4RTU/M4 I/O base unit. Table 3-5 contains descriptions for each
COM1 pin for both 2-wire and 4-wire modes.
Note that the interrupt lines can be used to add interrupt capability to Opto 22 I/O units connected to an
M4RTU/M4 I/O via an RS-485 serial link (remote).
Table 3-5: Pin Descriptions for the M4RTU/M4 I/O COM1 Serial Port
Pin
2-wire Mode
4-wire Mode
1
Transmit/Receive Plus (TX/RX +)
Transmit Plus (TX +)
2
Transmit/Receive Minus (TX/RX -)
Transmit Minus (TX -)
3
Common Ground (GND)
Common Ground (GND)
4
No Connection (N/C)
Receive Plus (RX +)
5
No Connection (N/C)
Receive Minus (RX -)
6
Interrupt Plus (IRQ +)
Interrupt Plus (IRQ +)
7
Interrupt Minus (IRQ -)
Interrupt Minus (IRQ -)
Summary of Contents for Modular M4RTU
Page 6: ...6 M4RTU M4 I O User s Guide TABLE OF CONTENTS...
Page 74: ...74 M4RTU M4 I O User s Guide FIELD WIRING...
Page 80: ...80 M4RTU M4 I O User s Guide PRODUCT SPECIFICATIONS...
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...
Page 89: ...M4RTU M4 I O User s Guide 89 WORKSHEETS Figure F 3 M4RTUX I O Extender I O Module Worksheet...
Page 91: ...M4RTU M4 I O User s Guide 91 WORKSHEETS Figure F 5 Field Wiring Worksheet Example 2...
Page 94: ...94 M4RTU M4 I O User s Guide WORKSHEETS...
