ADC MDM-TEL
Modem
Document
MDM-TEL Application Note.doc
Page 14 of 16
14
Last reviewed: 03/07/2002
Local
Modem
IBM Compatible
Remote
Modem
PLC
Connecting two Direct Logic PLC’s together through the MDM-TEL modem:
Wiring:
The modem requires a Positive 10 to 30 VDC signal to initiate dialing. Once the connection is
made, the modem will then source back a Positive 10 to 30 VDC signal to use in the PLC as
notification to start transmitting data. Here is an example wiring diagram:
You must make sure that you use the correct I/O cards for this. The output from the PLC to
initiate the modem dialing requires either a relay output card or a DC sourcing card. The output
from the MDM requires a sourcing input. Some examples are:
DL05:
D0-05DR and D0-05DR-D
DL205:
Input cards:
D2-08ND3, D2-16ND3-2, D2-32ND3
Output cards:
D2-16TD2-2, D2-04TRS, D2-08TR, F2-08TRS, F2-08TR,
D2-12TR and D2-08CDR
DL405:
Input cards:
D4-08ND3S, D4-16ND2, D4-16ND2F, D4-32ND3-1,
D4-32ND3-2, D4-64ND2, D4-16NE3
Output cards:
D4-16TD2, D4-32TD2, D4-08TR, F4-08TRS-1, F4-08TRS-2,
D4-16TR
