45

Users Manual

To determine which computer interface is enabled, press in POWER to turn the meter on. Press S, then press R. If "baud" and a rate are displayed, the RS-232 interface is enabled; if "IEEE" is displayed, the IEEE-488 interface is enabled.

Preparing the Meter for Operations via the RS-232 Interface

The RS-232 interface allows ASCII, asynchronous, serial communication between the meter and a host, a serial printer, or terminal.

Setting Communication Parameters (RS-232)

The communication parameters for the RS-232 computer interface are shown in Table 5-1 as they are set when the meter leaves the factory. Interface, baud rate and parity parameters can be set directly by the user; data bit and stop bit parameters cannot.

In order for the meter and host to communicate via the RS-232 interface, the communication parameters of the meter must match those of the host. Setting RS-232 communication parameters can only be done from the front panel. If the communications parameters of the host and meter do not match, proceed as follows to select the appropriate baud rate and parity parameters for the meter:

1.Press in the POWER button on the front panel to turn the meter on.

2.Press S, then press R.

The baud rate currently selected is shown in the primary display, and "baud" is shown in the secondary display.

Table 5-1. Factory Settings of RS-232 Communication Parameters

Parameter

Interface

Baud Rate

Parity

Number of Data Bits

Number of Stop Bits

Echo

Factory Setting

RS-232 (Print-only rate set to 0) 9600

None (Parity bit 0)

8 (7 Data bits plus 1 parity bit)

1 On

3.Press Uor Tto scroll to the desired baud; then press Eto set the selected baud rate.

If a baud rate other than "IEEE" is selected, the RS-232 interface is enabled, and the list editor is invoked on parity.

4.Press Uor Tto scroll to "E" for even, "Odd", or "no" for none; then press E to set the parity.

5."Echo" now appears on the secondary display, and "On" or "OFF" appears on the primary display.

When Echo is "On", each command sent to the meter over the RS-232 interface is "echoed" to the host’s display screen. If Echo is "OFF", commands are not echoed.

To select an Echo mode, press Tor Uto select "OFF" or "On", respectively. Then press Eto set the selected Echo state.

5-2

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Fluke 45 user manual Preparing the Meter for Operations via the RS-232 Interface, Setting Communication Parameters RS-232

45 specifications

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