V24 Tests; Sending And Receiving (1); Send Test String To Device (2) - GE MAC 1200 Service Manual

V24 Tests

Sending and Receiving (1)

Send Test String to Device (2)

Revision D
System Test Function: V24 Tests
Several possibilities are available to test the serial interface. Signal transmission and
receiving of the interface can be tested by an internal feedback from TXD and RXD.
Signal transmission and receiving can also be tested with a remote station.
For the test with a remote station, the connection cable from MAC 1200 resting
ECG analysis system to PC, PN 223 362 03 is required. In addition, the following
transmission protocol should be adjusted at the remote station.

1 start bit, 8 data bits, no parity

1 stop bit
 Baud rate 19200
Pressing the 6 key calls up the following menu.
Key
1 Sending and receiving
2 Send test string to device
3 Send/Receive with device
A Abort (terminate interface test)
This test enables complete testing of the RS232 signal path for transmitting and
receiving, including RS232 driver and connector.
This test requires an RS232 connector with an internal bridge from pin 2 (RXDE) to
pin 3 (TXDE). Depending on the result of the test, the following message appears.
If test result is OK: Out: Hello world!
In: Hello world!
Out: Hello world! 
If an error occurs:
In: ERROR (In)
In this test a remote station, e.g., PC must be connected up and have a terminal
program which can receive signals and be configured for the above-mentioned
protocol. If the remote station is on receive, then every time the 2 key is pressed the
test string Hello world! is transmitted to the remote station. Simultaneously, the
following message appears on the display.

v24-Settings: 19200, 8, n, 1

Out: Hello world!
MAC 1200 resting ECG analysis system
2012250-095
Table 6. Interface Test
Test Performed

3-11