Specifications

Multiport Serial TAP Input
128 025-9035AA
UDS 202T Modem Hookup Example
This is an example of hooking up an external device to the Multiport card. Other
equipment may have different pin connections. This is only an example.
This shows the connection between our S66M punchdown block (using the first serial port
of the Multiport card) and the UDS (Universal Data Systems, a Motorola division) Model
202T Modem.
Figure 29: UDS 202T Modem Interface
Strap options:
• Strap the Transmit Carrier (RTS) option to the ON position. To prevent ground
loops, strap the Chassis/SYS GND option to OUT.
• Other straps do not matter or depend on your particular installation.
Put the 202T modem’s front panel switch in the Data position for operation.
Connect the 4-wire audio leased telephone line to the modem’s COMM LINE jack with a
properly wired modular plug.
Note This information is for older systems with a S66M punch-down
block.
Note Although the CTS and RTS lines are shown connected here, they
are not actually used for handshaking. The modem is always active
when the Multiport card is active (RTS comes on when card
software is active).
Pin#
GND 26
RX 2
TX 27
CTS 3
RTS 28
Pin#
7 Signal Ground
3 Receive Data
2 Transmitter Data
4 Request to Send
8 Data Carrier Detect
5 Clear to Send
6 Data Set Ready
1 Protective Ground
S66M Punch-down
Block
202T Modem
DB-25P
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