External Devices, Direct Serial Connection

EXTERNAL DEVICES

External devices can be connected either with a direct serial connection or with an Internet Protocol connection. An overview of each type of connection is provided below; refer to the specific instructions provided for each type of external device in the following pages.

Direct Serial Connection

A direct serial connection means connecting the device to one of the COM ports on the VMX300(-E) rear panel. If your system contains more than one VMX300(-E) workstation, be sure to connect the device to the workstation that the device driver runs on.

VMX300(-E)

EXTERNAL DEVICE

SERIAL DATA

Figure 24. Sample of a Direct Serial Connection for an External Device

The VMX300(-E) provides the following types of COM ports:

•RS-232:COM 1, COM 2

•RS-422:COM 3, COM 4

After installing system hardware, ensure that the device’s internal settings match the VMX300(-E) COM port serial communication settings. If they do not match, you must either

•configure the internal settings to match the VMX300(-E) COM port default settings, as identified in Table F, or

•change the VMX300(-E) COM port settings to match the device; instructions are provided in the Appendix on page 42.

Table F. Default Settings for VMX300(-E) COM Ports

VMX300(-E) COM Port	Default Settings

COM 1, COM 2	RS-232, 9600 baud, no parity, 8 data bits, 1 stop bit

COM 3, COM 4	RS-422, 2400 baud, no parity, 8 data bits, 1 stop bit

Table G provides the pin assignments for the VMX300(-E) COM ports and Figure 25 on page 28 illustrates the RS-422 wall block connections.

Table G. VMX300(-E) COM Port Pin Assignments

RS-232 Pin Assignments (COM 1, COM 2)

PIN 2	RX

PIN 3	TX

PIN 5	Ground

RS-422 Pin Assignments (COM 3, COM 4)

PIN 2	Rx+

PIN 3	Tx-

PIN 5	Ground

PIN 7	Tx+

PIN 8	Rx-

C1552M-C (7/07)