3. DIAGNOSTIC TEST OPERATION EO18-11006A
3.7 RS-232C Loop Back Test
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3.7 RS-232C Loop Back Test
(1) Contents
A Loop back test for the RS-232C interface line is performed.
Before starting the test, connect a loop back connector to the COM port to be tested.
(2) Operation
Mode Lock: BLIND
Key Operation: 80 [X] (or [@/FOR]) 6 [ST] n
[AT/TL]
COM port number: 1 (COM 1)
(3) Print format
(4) Display
(5) Quit
The test ends by pressing the [ITEM CORR] key.
NOTES:
1. In the Receipt OFF mode, the print data is printed only on the journal.
2. When the power is turned OFF during the test, it will be resumed at the power on time unless the Mode Lock
position is “BLIND”.
3. The wiring pattern of the loop back connector is as shown below.
NC 1
RXD 2
TXD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
NC 9
D 1 – 6
**** * ****
Test count (0000 to 9999)
Status
0: Normal termination
1: Data receive error
2: Parity, overrun, or framing error
3: Timeout error
4: DTR/DSR error or RTS/CTS erro
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