263
RS-232C Units Section 6-2
6-2-4 Components
Indicators The indicators display the status of the RS-232C Unit and the network.
Flow control Enable/Disable (RS/CS control only)
Flow Control Enabled
The RS (Request Send) signal is normally ON, but it turns
OFF when the receive buffer reaches 75% of capacity. CS
is always checked.
Flow Control Disabled
The RS (Request Send) signal is always ON. The Receive
Buffer Overflow Flag turns ON if the receive buffer over-
flows. CS is always checked.
Note: The CS signal is always checked. Data will not be
output if CS is not connected. Short-circuit the RS-CS sig-
nals when they are not used.
Transmission distance 15 m max.
Item Specification
Indicators
RS-232C
connector
port 1
RS-232C connector port 2
Communications connector
Power supply
terminal
DIP switch
Pins 1 to 6: Node address
Pins 7 and 8: Baud rate
Pins 9 and 10: Reserved (Always OFF)
(Refer to page 260.)
Indicator Color Status Meaning
MS
(Module
status)
Green ON Normal The Unit is operating normally.
Flashing Settings
incomplete
Settings are being read.
Red ON Fatal error A fatal error (hardware error) has
occurred.
Flashing Non-fatal
error
A non-fatal error, such as a switch
setting error, has occurred.
--- OFF No power
supply
Unit error, power is not being sup-
plied, the Unit is being reset, or wait-
ing for initial processing to start.
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