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8-6-2 Communications Board Settings
The following parameters must be set in advance in order to use the Protocol
Macro function through a Communications Board.
Communications Mode
Set the communications mode to Protocol Macro mode.
Port B: Set bits 12 through 15 of DM 6550 to 6.
Port A: Set bits 12 through 15 of DM 6555 to 6.
Standard Port Settings
Standard settings or custom settings can be used for ports A and B. The stan-
dard settings are used when the following bits are set to 0.
Port B: Bits 00 through 03 of DM 6550 (0: standard; 1: custom).
Port A: Bits 00 through 03 of DM 6555 (0: standard; 1: custom).
The standard settings are shown in the following table.
Item
Setting
Start bits
1
Data length
7
Stop bits
2
Parity
Even
Baud rate
9,600 bps
Custom Port Settings
Standard settings or custom settings can be used for ports A and B. The custom
settings are used when the following bits are set to 1.
Port B: Bits 00 through 03 of DM 6550 (0: standard; 1: custom).
Port A: Bits 00 through 03 of DM 6555 (0: standard; 1: custom).
The custom settings for Port B are defined in DM 6551 and the custom settings
for the Port A are defined in DM 6556.
Transmission Frame Format (See table below.)
Baud rate (See table below.)
15
0
Bit
DM 6551: Port B
DM 6556: Port A
Parameter
Setting
Start bits
Data length
Stop bits
Parity
Transmission Frame
F
00
1
7
1
Even
Format
01
1
7
1
Odd
02
1
7
1
None
03
1
7
2
Even
04
1
7
2
Odd
05
1
7
2
None
06
1
8
1
Even
07
1
8
1
Odd
08
1
8
1
None
09
1
8
2
Even
10
1
8
2
Odd
11
1
8
2
None
The Protocol Macro Function
Section 8-6
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