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Setup Area Allocations Section 10-2
5. Turn ON the Loopback Test Switch. To end the test, turn OFF the switch.
The Loopback Test Switches are as follows:
Board: CIO 1900, bit 06 for port 1 and bit 14 for port 2
Unit: n, bit 06 for port 1 and bit 14 for port 2 (n = CIO 1500 + 25 x
Unit No.)
Refer to
10-3 CIO Area Allocations.
6. Use the protocol status to check the results.
Refer to
10-3 CIO Area Allocations.
10-1-4 Indicators Used for the Loopback Test
When the test is being executed, the indicators shown below will flash. Use
the protocol status to check whether or not the test has been executed nor-
mally.
Serial Communications
Boards (CS Series Only)
Port 1: COMM1 indicator
Port 2: COMM2 indicator
Serial Communications
Units (CS/CJ Series)
Port 1: SD1/RD1 indicator
Port 2: SD2/RD2 indicator
10-2 Setup Area Allocations
This section describes the Setup Area allocated to the Serial Communications
Board and Serial Communications Units in the DM Area when loopback tests
are performed.
The loopback test is performed using the Host Link mode protocol. The Setup
is basically the same as for the Host Link mode.
m = D30000 + 100 × unit number
Serial Communications
Mode
Set the serial communications mode to F Hex to perform a loopback test.
For the other settings, refer to 4-2 Setup Area Allocations.
DM Area Bit Settings
Board
(CS Series only)
Unit
(CS/CJ Series)
Port 1Port 2Port 1Port 2
D32000 D32010 m m + 10 15 Port settings 0: Defaults, 1: User settings
14 to 12 Reserved
11 to 08 Serial communications mode: Always F Hex (Loopback test)
07 to 05 Reserved
04 Start bits
0: 1 bit; 1: 1 bit (1 start bit is always used regardless of this setting)
03 Data length 0: 7 bits, 1: 8 bits
02 Start bits 0: 2 bits, 1: 1 bit
01 Parity 0: Yes, 1: No
00 Parity 0: Even, 1: Odd
D32001 D32011 m + 1 m + 11 15 to 04 Reserved
03 to 00 Baud rate (bps)
0 hex: Default (9,600); 3 hex: 1,200; 4 hex: 2,400; 5 hex: 4,800;
6 hex: 9,600; 7 hex: 19,200; 8 hex: 38,400; 9 hex: 57,600;
A hex: 115,200
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