Mounting and Wiring
Remote Access
48 UMC800 Controller Installation and User Guide Release F
4/01
Zoom 56K Dualmode External Modem
Step Action
1Connect the modem to a PC. If your PC’s RS232 port has a 25-pin connector, use a DB-25
male to DB-25 female RS232 cable. If your PC’s RS232 port has a 9-pin connector, use a
DB-25 male to DB-9 female modem cable.
2Connect power to the modem.
3Power up the modem.
4Run a serial communication port program such as Hyperterminal.
5Within the communication program, select the port to which the modem is connected.
6Configure the port to these settings:
baud rate = 9600
data bits = 8
parity = none
stop bits = 1
flow control = none
7In the program’s terminal window, type in the letters “AT E1 Q0” followed by the enter key. The
modem should give an OK response.
8Enter the following command string:
AT &Y0 &C0 &D0 &R1 &S0 &K0 S0=1
Modem should respond with OK.
9Enter the following command string:
AT E0 Q1 &W0
Modem will not respond.
10 Power down the modem and disconnect it from the PC.
11 Connect the modem to the RS232 port of the UMC800 using a DB-25 male to DB-9 male
RS232 cable. Null modem cable may not work.
12 Connect the modem to a telephone jack.
13 Power up the modem and the UMC800.
14 On a remote computer, run Control Builder software.
15 Set up Control Builder to dial the UMC800.
16 Verify that communications is established with the remote UMC800.