Instruction manual

ControlWave Micro Instruction Manual (CI-ControlWave Micro)
2-24 Installation Revised Jun-2013
RS-232 COM
Port Cables
For the ControlWave Micro, half-duplex communications use Modbus
or BSAP protocol, while full-duplex communications use point-to-point
protocol (PPP). RS-232 ports use a “null modem” cable (see Figure 2-
17) to connect with other devices (such as a PC, a printer, another
ControlWave [except the CW_10/30/35]) when the ControlWave Micro
uses the full-duplex PPP protocol.
Note: You can configure the ControlWave Micro as either a master or
slave node on a Modbus or BSAP network.
Figure 2-16 illustrates the CPU module’s male 9-pin D-type connector.
Use the content provided in Table 2-8 to determine pin assignments for
the COM1 and COM2 ports and the expansion communication ports
COM4/5 and COM8/9.
Figure 2-16. Male DB9 9-Pin Connector
Table 2-8. RS-232 Port Connector Pin Assignment
Pin
RS-232
Signal RS-232 Description
1 DCD Data Carrier Detect Input
2 RXD Receive Data Input
3 TXD Transmit Data Output
4 DTR Data Terminal Ready Output
5 GND Signal/Power Ground
6 DSR Data Set Ready Input
7 RTS Request to Send Output
8 CTS Clear to Send Input
9 N/A
Use the “null modem” cable for full-duplex (PPP protocol)
communications when connecting a ControlWave Micro to a PC. (See
top part of Figure 2-17.)