4 rs232 test – Metrohm 709 IC Pump User Manual

Page 42

4 Notes – Maintenance – Faults

709 IC Pump

4.4.4 RS232

Test

This test is meaningful only if the 709 IC Pump

is used interconnected with other instruments

via RS 232 connection. In addition, a

3.496.8480 Test plug normally used in the re-

pair service is required for this test. However,

this plug can also be purchased by customers

under the above number.
For the sake of completeness, the procedure

is described here.
(If a diagnostic test of the RS232 interface is

not required, continue with section 4.4.5)
1. Power off.
2. Insert 3.496.8480 plug in port "RS232" 37.
3. Sliding switch 36 on rear panel to setting "RS232".
4. Press and hold key 4.

2 . .

2 0 0

The test runs automatically and checks several functions in

succession. If one of these functions is faulty, the display

"2 0 0" does not appear directly but some value is shown

briefly. If, e.g., no test plug is plugged in, the following appears:

2 . .

2 0 8

2 0 0

6. Power off.
7. Remove test plug.

Connections in the

3.496.8480 plug

TxD
RxD

DCD

DTR
DSR

RTS
CTS