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PROTOCOL CONVERTER A/S-2G
12
3.3.5 CARRIER OPTIONS
If the carrier detect signal is to be driven by the A/S-2G configuration (DCE), the jumper labeled CAR A
ENB must be installed. CAR A ENB is located below U20. Refer to the printed circuit board, Figure 5-2,
on page 28.
The carrier control jumper, CARR A, in between U18 and U19 on the circuit board (See Figure 5-2 on
page 28) should be set as follows:
(a) continuous carrier—place the jumper over the ON position.
(b) switched carrier equal to the RTS signal from the A/S-2G—place the jumper over the CNT position.
If the A/S-2G asynchronous port is configured as DCE, place a jumper over CAR A ENB and place the
CARR A jumper over ON.
3.3.6 CABLE REQUIREMENT
Use an RS-232 cable which is pinned straight through, i.e. 1 to 1, 2 to 2, 3 to 3, etc., to connect the A/S-
2G’s asynchronous port to the modem, terminal, or CPU. Leads 1 through 8 and 20 are required (see
Section 5.3 on page 25).
3.4 PREPARING THE A/S-2G FOR CONNECTION TO A SYNCHRONOUS DEVICE
The synchronous port (Port B) is designed to connect to a synchronous modem, modem eliminator, or
terminal. Set the switches, shunts, and jumpers as described below, then plug a male RS-232 connector
into the A/S-2G’s female receptacle. Sex-change adapters, connectors, and cable are available if you
need them.
3.4.1 DATA TERMINAL READY (DTR) SIGNAL OPTIONS
The synchronous port DTR option control is a jumper labeled DTR B. It is just under U26 on the
circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a constant high
signal on DTR. When this jumper is placed over CNT, the A/S-2G will drop DTR during a reset or
after receipt of a DLE EOT sequence from either the synchronous or the asynchronous port.
For most installations, position the jumper over ON.
3.4.2 CLEAR TO SEND (CTS) SIGNAL OPTIONS
The synchronous port CTS option control is a jumper labeled CTS B. It is located between U21 and
U25 on the circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a
constant high signal on CTS. When this jumper is placed over CNT, the A/S-2G will raise RTS when
Rate 5 6 7 8
EXT OFF OFF OFF OFF
75 OFF OFF OFF ON
110 OFF OFF ON OFF
134.5 OFF OFF ON ON
150 OFF ON OFF OFF
300 OFF ON OFF ON
600 OFF ON ON OFF
1200 OFF ON ON ON
Rate 5 6 7 8
1800 ON OFF OFF OFF
2000 ON OFF OFF ON
2400 ON OFF ON OFF
4800 ON ON OFF OFF
7200 ON ON OFF ON
9600 ON ON ON OFF
19200 ON ON ON ON
PORT B (Synchronous) BAUD RATE
Table 3-2. Port B (Synchronous) Baud Rates.