Specifications

2240 Fiber Optic Modem

Table 4-C.

RS-530 Signals and

Pin Assignments

Two end-to-end control leads are provided as part of this interface. An input to

RTS (Request To Send) is transmitted to the DCD (Data Carrier Detect) output at

the other end of the link (refer to Sections 4.4.1, "RTS-Bias Jumper," and 4.4.2,

"DCD Jumper"). The factory setting (refer to Section 4.4.7, "CTS_OUT Jumper")

configures CTS as a local control. In this mode, CTS (Clear To Send) follows

RTS locally but is delayed approximately 1 millisecond when RTS turns ON (refer

to Section 4.4.6, "C,TS_GATE Jumper"). Changing the CTS_OUT jumper

enables the second DTR to CTS control channel. In addition, the CTS (A) jumper

allows configuring the CTS(A) output lead for cryptography applications (refer to

Section 4.4.8, "CTS (A) Jumper").

Pin A/B Signal Name Direction

FG 01 Frame Ground -

TD 02/14 Transmit Data to modem

RD 03/16 Receive Data from modem

RTS 04/19 Request to Send to modem

CTS 05/13 Clear to Send from modem

DSR 06/22 Data Set Ready from modem

SG 07 Signal Ground -

DCD 08/10 Data Carrier Detect from modem

SCR 17/09 Receive Clock from modem

SCT 15/12 * Transmit Clock to/from modem

SCTE 24/11 External Tx Clock to modem

DTR 20/23 Data Terminal Ready to modem

LL 18 ** Local Loopback to modem

RL 21 ** Remote Loopback to modem

TM 25 Test Mode from modem

* Becomes extra clock input if SCT switch is set to IN position.

** These signals are single ended and activate a modem’s system test.

All other signals are balanced.