Cabling; Connecting The Ruska 6220 To The Lem Pressure Serial Port; Ruska 7220 To The Lem Pressure Serial Port; Use With Other Rs232 Output Transducers - Fluke RUSKA 2456-LEM User Manual

Cabling

Connecting the RUSKA 6220 to the LEM Pressure Serial Port

*Connect Pins 4 & 5 together.
Refer to 6220 Manual and Chapter 6, DB9 Connections, of this manual for additional
information.

RUSKA 7220 to the LEM Pressure Serial Port

Connecting the RUSKA Model 7220 to the LEM pressure serial port requires a Null modem
adapter or Null modem cable DB9 M / DB 9 F. Only Pins 2 and 3 must be swapped in the Null
Modem cable.

Use with Other RS232 Output Transducers

Protocol

The LEM can retrieve pressure data from other "smart" pressure sensors, as long as the return
string can be parsed. The string returned to the LEM must be in ASCII characters.
The LEM breaks down the returned string as follows:
1. Delete Prefix—all non-numeric characters are deleted up to the first numeric character.
2. The Exponent character (E or e) is located.
3. A one or two digit numeric exponent is read following the Exponent character.
Examples of valid returned strings:
101.23
101.23kPa
1.0123E02
PA, 1.0123e02 kPa
PA, 101.23
Table 4-1. RUSKA 6220 25 Pin RS-232 Connector
PIN
2 Transmitted data (to PPG)
3 Receive Data (from PPG)
4* RTS (must be set for PPG to transmit)
5* CTS (always set by PPG)
7 GND
Table 4-2. RUSKA 6220 DB25 and LEM DB9 Connections
6220
DB25
2
3
7
Remote Pressure Capture
DESCRIPTION
LEM
DB9
3
2
5
4
Cabling
4-3