INSTALLATION MANUAL | 11 |
There are several different forms of communications networks. Maple Systems’ OITs utilize the multidrop format. The host controller, located at one of the network ends, is connected to the OITs via a continuous
HOST | See |
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| Detail A & B |
| TERMINATOR |
Less than
4000'
Less than 12" Shielded Cable
TERMINATOR
OIT #1
2 Pair Twisted |
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Shielded Cable |
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24 Gage Wire |
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From Host or |
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Previous OIT |
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Drain | CHASSISGND | RXD+/TXD+ | SIGGND | SIGGND | ||
Wires | ||||||
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| CHASSIS GND | RXD+ TXD+ | RXD- TXD- | SIGGND |
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OIT #2
From Host or
Previous OIT
To More
OITs
Drain
Wires
OIT #100 3 Pair Twisted
Shielded Cable
24 Gage Wire
To More
OITs
CHASSISGND | TXD+ | TXD- | RXD+ | RXD- | SIGGND | SIGGND |
TO OIT | TO OIT |
Detail A | Detail B |
5 Wire Termination | 5 Wire Termination |
If you decide to use
•The host controller must disable or
•The ability to stay logged on to a particular OIT by sending the command terminator instead of the line terminator is not available in this mode. Therefore, each command sent from the host controller should end with the appropriate line terminator.
•If the host controller sends a command that requires a response from the OIT, the host controller must wait for a response from the OIT before sending another command. Otherwise, a situation can occur in which the OIT and the host controller attempt to transmit at the same time cuasing unpredictable results.
•The ASCII strings sent by the OIT’s function keys should not include any control characters which the other OITs on the network could misinterpret, such as the line terminator or command terminator.