Emerson Process Management Bristol ControlWave ExpressPAC - Manual (Page 35)

ControlWave ExpressPAC Instruction Manual (CI-ControlWave EPAC)
Revised Mar-2011 Installation 2-21
2.3.6 Connections to RS-232 Serial Port(s) on the CPU/System
Controller Board
An RS-232 port provides point-to-point, half-duplex and full-duplex
communications (for a maximum of 20 feet using data quality cable).
Your CPU includes two RS-232 ports and one port configurable for
either RS-232 or RS-485 operation.
RS-232 COM
Port Names and
Connectors
RS-232 COM ports use different connector types.
Table 2-6. RS-232 Connectors
Connector Name # Pins and Type Notes
J4 COM1 9-pin male D-type Choice of active connector for COM1
determined by jumper W18.
J4 is factory wired to the local port connector
on the outside bottom of the enclosure cover.
J11 COM1 3-pin male Choice of active connector for COM1
determined by jumper W18.
TB3 COM2 8-pin terminal block Supports the modem/radio option.
TB4 COM3 5-pin terminal block This port can be configured as either RS-232
or RS-485. See Section 2.3.7 for more
information.
RS-232
COM1/COM2
Port Cables
For the ControlWave ExpressPAC, 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 2-11) to connect with other devices (such as a PC, a printer,
another ControlWave [except the CW_10/30/35]) when the
ControlWave ExpressPAC uses the full-duplex PPP protocol.
Note
: You can configure the ControlWave ExpressPAC as either a
master or slave node on a Modbus or BSAP network.
Figure 2-10 illustrates the CPU module’s male 9-pin D-type connector.
for COM1. Use the content provided in Table 2-7 to determine pin
assignments for the COM1 and COM2 ports.
Figure 2-10. Male DB9 9-Pin Connector