User-Initiated Test; Rs-232-C/423 Loopback Connections - Siemens SIMATIC TI500 User Manual

User-Initiated Test

TIWAY I Gateway User Manual
You should run the user-initiated test only when the Gateway is in Off-line
mode (that is, when the On-line/Off-line switch is in the OFFLINE position).
Normal Gateway operation is suspended during this test mode.
NOTE: Before initiating the diagnostic routine, make sure that the network
and host computer cables are disconnected from the Gateway, and that the
Gateway is in off-line mode. Only the GATEWAY GOOD indicator should be
lit. If ONLINE is lit, you must first reset the Gateway before running the
test.
1. Install a loopback connector on each RS-232-C port; (without one, the
port will fail the external loopback subtest). Table 3-4 shows the signal
line connections made by the loopback connector.
Table 3-4 RS-232-C/423 Loopback Connections
Pin # to Pin #
2 3
4 5
20 6,8
2. Press the SELF-TEST button to start the user-initiated test.
The diagnostics will perform internal and external loopback, jabberstop*,
and data rate subtests to each channel. If a media card is missing or is bad,
the test will fail. The subtests for the user-initiated diagnostic test include
the following.
RAM data and address line verification (internal and external RAM)
ROM integrity using CRC and checksum
Serial Communications Chip (SCC) using internal loopback and baud rate
Transmitter/Receiver via external loopback and jabberstop
Verification of watchdog timer
Indicator operation
*The jabberstop is a Gateway feature which prevents a device from monopolizing the network.
Signal
Data out
Request to Send (RTS)
Data Terminal Ready (DTR)
Gateway Installation and Configuration
to Signal
Data In
Clear to Send (CTS)
Data Set Ready (DSR) /
Data Carrier Detect (DCD)
3-13