CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 50)

2240 Fiber Optic Modem User Manual Chapter 4 Data Interfaces
RS-530 Interface Model 430
50
4.4.6 CTS_GATE Jumper
NOTE: This jumper is functional only when the CTS_OUT jumper is in the CTS
position.
Then, the CTS_GATE jumper controls the state of CTS when the local RTS is ON. When the
jumper is in the ON position, CTS follows RTS only. The CD position allows the 2240’s standard
data interface signal CD to gate CTS. In the CD jumper position and with local RTS ON, CTS will
turn ON either when the modem’s fiber optic receiver is in sync (main PCBA internal switch S1
CD/DCD = OFF and CD/SYNC = ON) or the RTS signal at the far end is ON (main PCBA internal
switch S1 CD/DCD = ON and CD/SYNC = OFF). Refer to section 2.1.3.1 for more information on
the internal switch S1 CD/DCD and CD/SYNC positions.
Factory setting: ON
4.4.7 CTS_OUT Jumper
This jumper selects the source of the CTS output signal. In the CTS position, CTS provides the
local CTS function (refer to section 4.4.6) In the RI position, the CTS tracks the state of the DTR
input at the far end 2240.
Factory setting: CTS
4.4.8 CTS (A) Jumper
This jumper selects the electrical characteristic of the CTS (A) lead. In the NORM position, the
CTS (A) is a normal RS-422 balanced driver, as per RS-530. The KG position is intended for
interfacing to cryptography equipment. If you are not interested in KG applications, leave this
jumper in the factory NORM position and skip the following KG jumper settings for the -430
interface.
In the KG position, CTS (A) follows the DTR input at the far end and the output is driven by an
unbalanced driver whose output voltage swing is controlled by the KG_SWING jumper and
whose sense is controlled by the KG_OUT jumper.
Factory setting: NORM
4.4.9 1 KG_SWING Jumper
This jumper selects the output swing for the CTS (A) lead when the CTS (A) jumper is in the KG
position. Refer to Table 4-5.
4.4.10 2 KG_OUT Jumper
This jumper can invert the sense of the CTS (A) when the CTS (A) jumper is in the KG position.
Refer to Table 4-5.
Table 4-5. Settings For the CTS (A) Jumper
CTS (A) KG_OUT KG_SWING
CTS (A) lead
when DTR is
asserted at far
end 2240
CTS (A) lead
when DTR is
negated at far
end 2240
KG NORM +6V_GND +6V GND