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| 4/22 | SD | 103 | Send Data | ← |
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| 5/23 | SCT | 114 | Send Timing | → |
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| 6/24 | RD | 104 | Receive Data | → |
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| 7/25 | RTS | 105 | Request to Send | ← |
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| 8/26 | SCR | 115 | Receive Timing | → |
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| 9/27 | CTS | 106 | Clear to Send | → |
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| 11/29 | DSR | 107 | Data Set Ready | → |
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| 12/30 | DTR | 108 | Data Terminal Ready | ← |
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| 13/31 | DCD | 109 | Receiver Ready | → |
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| 15 | IC | 125 | Incoming Call | → |
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Pin (male) arrangement |
| 19 | SG | 102 | Signal Ground | – | |
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Pin nos.
Figure 15 RS-449 Interface
Fabrication of plug case assy.
Aluminum tape
Fold back braided shield onto cable; tape shield as shown.
Cable Clamp
Cable
Figure 16 Fabrication of plug case (same procedure for 25 pin, 37 pin)
5.2.2 Modifying the RF CONV board in the communication unit
1.Turn off the communication unit.
2.Detach the cover.
3.Replace the RF CONV Board as follows if it is version
a)Unfasten the coaxial connector nut.
b)Unplug all connectors from the RF CONV Board.
c)Dismount the RF CONV Board.
d)Mount the new RF CONV Board, plug in connectors to the board, and fasten the coaxial connector nut.
e)For the new RF CONV Board, set R135 according to antenna cable length as shown in the table below. See Figure 19 for the location of R135.
21
